Rollup merge of #91266 - jam1garner:fmt-ptr-fix, r=dtolnay
Rollup merge of #91266 - jam1garner:fmt-ptr-fix, r=dtolnay

Use non-generic inner function for pointer formatting

Previously, despite the implementation being type-unaware, `fmt::Pointer`'s implementation for `*const T` in monomorphized. This affects:

* `fmt::Debug` for `*const T`
* `fmt::Debug` for `*mut T`
* `fmt::Pointer` for `*const T`
* `fmt::Pointer` for `*mut T`

And since the implementation is non-trivial, this results in a large amount of LLVM bitcode being generated. For example, with a large bindgen project with Debug implementations enabled, it will generate a lot of calls to `fmt::Debug for *const T`, which in turn will perform codegen for a copy of this function for every type.

For example, in a real-world bindgen'd header I've been testing with (4,189,245 lines of bindgen Rust with layout tests disabled) the difference between a slightly old nightly (`rustc 1.58.0-nightly (e249ce6b2 2021-10-30)`) and this PR:

<details>
<summary>Nightly (Click to Expand)</summary>

```
  Lines           Copies         Function name
  -----           ------         -------------
  7256000 (100%)  216544 (100%)  (TOTAL)
  1815449 (25.0%)  24206 (11.2%) <*const T as core::fmt::Pointer>::fmt
   300248 (4.1%)   29579 (13.7%) <&T as core::fmt::Debug>::fmt
   290328 (4.0%)   24194 (11.2%) <*mut T as core::fmt::Pointer>::fmt
   217746 (3.0%)   24194 (11.2%) <*mut T as core::fmt::Debug>::fmt
   123329 (1.7%)    1486 (0.7%)  core::fmt::builders::DebugList::entries
    72790 (1.0%)    1486 (0.7%)  core::slice::iter::Iter<T>::post_inc_start
    71313 (1.0%)    1486 (0.7%)  core::slice::iter::Iter<T>::new
    68329 (0.9%)    1486 (0.7%)  <core::slice::iter::Iter<T> as core::iter::traits::iterator::Iterator>::next
    38636 (0.5%)    1486 (0.7%)  <[T] as core::fmt::Debug>::fmt
    26874 (0.4%)    1493 (0.7%)  core::array::<impl core::fmt::Debug for [T; N]>::fmt
    22290 (0.3%)    1486 (0.7%)  core::slice::index::<impl core::ops::index::Index<I> for [T]>::index
    19407 (0.3%)    1493 (0.7%)  core::array::<impl core::ops::index::Index<I> for [T; N]>::index
    19318 (0.3%)    1486 (0.7%)  core::slice::<impl [T]>::iter
    17832 (0.2%)    1486 (0.7%)  core::ptr::const_ptr::<impl *const T>::offset
    17832 (0.2%)    1486 (0.7%)  core::ptr::mut_ptr::<impl *mut T>::offset
    16346 (0.2%)    1486 (0.7%)  <core::ops::range::RangeFull as core::slice::index::SliceIndex<[T]>>::index
    13374 (0.2%)    1486 (0.7%)  <I as core::iter::traits::collect::IntoIterator>::into_iter
    13374 (0.2%)    1486 (0.7%)  core::ptr::const_ptr::<impl *const T>::add
    13371 (0.2%)    1486 (0.7%)  core::ptr::const_ptr::<impl *const T>::is_null
    13371 (0.2%)    1486 (0.7%)  core::ptr::mut_ptr::<impl *mut T>::is_null
    11888 (0.2%)    1486 (0.7%)  core::slice::<impl [T]>::as_ptr
    11879 (0.2%)    1486 (0.7%)  core::ptr::non_null::NonNull<T>::new_unchecked
     7421 (0.1%)    1486 (0.7%)  core::ptr::non_null::NonNull<T>::as_ptr

```

</details>

<details>
<summary>This PR (Click to Expand)</summary>

```
   Lines           Copies         Function name
  -----           ------         -------------
  5684504 (100%)  216542 (100%)  (TOTAL)
   300248 (5.3%)   29579 (13.7%) <&T as core::fmt::Debug>::fmt
   290328 (5.1%)   24194 (11.2%) <*mut T as core::fmt::Pointer>::fmt
   266265 (4.7%)   24206 (11.2%) <*const T as core::fmt::Pointer>::fmt
   217746 (3.8%)   24194 (11.2%) <*mut T as core::fmt::Debug>::fmt
   101039 (1.8%)    1486 (0.7%)  core::fmt::builders::DebugList::entries
    72790 (1.3%)    1486 (0.7%)  core::slice::iter::Iter<T>::post_inc_start
    71313 (1.3%)    1486 (0.7%)  core::slice::iter::Iter<T>::new
    68329 (1.2%)    1486 (0.7%)  <core::slice::iter::Iter<T> as core::iter::traits::iterator::Iterator>::next
    38636 (0.7%)    1486 (0.7%)  <[T] as core::fmt::Debug>::fmt
    26874 (0.5%)    1493 (0.7%)  core::array::<impl core::fmt::Debug for [T; N]>::fmt
    22290 (0.4%)    1486 (0.7%)  core::slice::index::<impl core::ops::index::Index<I> for [T]>::index
    19407 (0.3%)    1493 (0.7%)  core::array::<impl core::ops::index::Index<I> for [T; N]>::index
    19318 (0.3%)    1486 (0.7%)  core::slice::<impl [T]>::iter
    17832 (0.3%)    1486 (0.7%)  core::ptr::const_ptr::<impl *const T>::offset
    17832 (0.3%)    1486 (0.7%)  core::ptr::mut_ptr::<impl *mut T>::offset
    16346 (0.3%)    1486 (0.7%)  <core::ops::range::RangeFull as core::slice::index::SliceIndex<[T]>>::index
    13374 (0.2%)    1486 (0.7%)  <I as core::iter::traits::collect::IntoIterator>::into_iter
    13374 (0.2%)    1486 (0.7%)  core::ptr::const_ptr::<impl *const T>::add
    13371 (0.2%)    1486 (0.7%)  core::ptr::const_ptr::<impl *const T>::is_null
    13371 (0.2%)    1486 (0.7%)  core::ptr::mut_ptr::<impl *mut T>::is_null
    11888 (0.2%)    1486 (0.7%)  core::slice::<impl [T]>::as_ptr
    11879 (0.2%)    1486 (0.7%)  core::ptr::non_null::NonNull<T>::new_unchecked
     7421 (0.1%)    1486 (0.7%)  core::ptr::non_null::NonNull<T>::as_ptr

```

</details>

Output generated using `cargo llvm-lines` version 0.4.12.

Summary of differences:

| rustc Version | Total LLVM line count | `*const T as fmt::Pointer` LLVM lines | Compilation Time |
|-|-|-|-|
| `nightly` | 7256000 | 1815449 (25.0% of binary) | 537.014 |
| PR | 5684504 (-21.65%) | 266265 (4.7% of binary) (-85.3% from nightly) | 502.990 |

This results in a pretty noticeable as the majority of rustc's time is spent in either codegen or LLVM, in this case, and is significantly improved by disabling derives for `fmt::Debug`, as it prevents generating all this LLVM IR to be handled.

Here's a run time comparison with nightly on the same codebase (commit 454cc5fb built from source vs 37c8f25 from my PR built from source):

<details>
<summary>nightly (Click to Expand)</summary>

```
time:   2.370; rss:   56MB -> 1118MB (+1062MB)	parse_crate
time:   0.000; rss: 1118MB -> 1118MB (   +0MB)	attributes_injection
time:   0.000; rss: 1118MB -> 1118MB (   +0MB)	incr_comp_prepare_session_directory
time:   0.000; rss: 1118MB -> 1118MB (   +0MB)	incr_comp_garbage_collect_session_directories
time:   0.000; rss: 1120MB -> 1120MB (   +0MB)	plugin_loading
time:   0.000; rss: 1120MB -> 1120MB (   +0MB)	plugin_registration
time:   0.000; rss: 1120MB -> 1120MB (   +0MB)	crate_injection
time:  13.897; rss: 1120MB -> 3147MB (+2027MB)	expand_crate
time:   0.002; rss: 3147MB -> 3147MB (   +0MB)	check_unused_macros
time:  13.900; rss: 1120MB -> 3147MB (+2027MB)	macro_expand_crate
time:   0.002; rss: 3147MB -> 3147MB (   +0MB)	maybe_building_test_harness
time:   0.503; rss: 3147MB -> 3147MB (   +0MB)	AST_validation
time:   0.000; rss: 3147MB -> 3147MB (   +0MB)	maybe_create_a_macro_crate
time:   0.002; rss: 3147MB -> 3147MB (   +0MB)	finalize_imports
time:   0.502; rss: 3147MB -> 3153MB (   +6MB)	finalize_macro_resolutions
time:   4.478; rss: 3153MB -> 3574MB ( +420MB)	late_resolve_crate
time:   0.000; rss: 3574MB -> 3574MB (   +0MB)	resolve_main
time:   0.332; rss: 3574MB -> 3574MB (   +0MB)	resolve_check_unused
time:   0.000; rss: 3574MB -> 3574MB (   +0MB)	resolve_report_errors
time:   0.279; rss: 3574MB -> 3574MB (   +0MB)	resolve_postprocess
time:   5.595; rss: 3147MB -> 3574MB ( +427MB)	resolve_crate
time:   0.382; rss: 3574MB -> 3574MB (   +0MB)	complete_gated_feature_checking
time:  20.526; rss: 1120MB -> 3574MB (+2454MB)	configure_and_expand
time:   0.000; rss: 3574MB -> 3574MB (   +0MB)	prepare_outputs
time:   0.000; rss: 3574MB -> 3574MB (   +0MB)	blocked_on_dep_graph_loading
time:  65.992; rss: 3574MB -> 6317MB (+2743MB)	hir_lowering
time:   1.117; rss: 6317MB -> 6323MB (   +6MB)	early_lint_checks
time:   1.447; rss: 6323MB -> 6271MB (  -52MB)	drop_ast
time:   0.002; rss: 5838MB -> 5838MB (   +0MB)	setup_global_ctxt
time:   0.000; rss: 5843MB -> 5843MB (   +0MB)	looking_for_entry_point
time:   0.313; rss: 5843MB -> 5844MB (   +1MB)	looking_for_derive_registrar
time:   9.652; rss: 5843MB -> 6065MB ( +222MB)	misc_checking_1
time:   9.713; rss: 6065MB -> 6769MB ( +704MB)	type_collecting
time:   0.665; rss: 6769MB -> 6769MB (   +0MB)	impl_wf_inference
time:   0.064; rss: 6769MB -> 6769MB (   +0MB)	unsafety_checking
time:   3.095; rss: 6769MB -> 6792MB (  +23MB)	coherence_checking
time:  21.282; rss: 6792MB -> 7546MB ( +754MB)	wf_checking
time:   5.404; rss: 7546MB -> 7681MB ( +135MB)	item_types_checking
time:  79.665; rss: 7681MB -> 8075MB ( +394MB)	item_bodies_checking
time: 120.166; rss: 6065MB -> 8081MB (+2016MB)	type_check_crate
time:   2.038; rss: 8081MB -> 8085MB (   +4MB)	match_checking
time:   1.300; rss: 8085MB -> 8113MB (  +28MB)	liveness_and_intrinsic_checking
time:   3.338; rss: 8081MB -> 8113MB (  +32MB)	misc_checking_2
time:  68.612; rss: 8113MB -> 9285MB (+1172MB)	MIR_borrow_checking
time:   0.622; rss: 9285MB -> 9301MB (  +17MB)	MIR_effect_checking
time:   0.000; rss: 9301MB -> 9301MB (   +0MB)	layout_testing
time:   4.331; rss: 9383MB -> 9510MB ( +127MB)	death_checking
time:   0.032; rss: 9510MB -> 9510MB (   +0MB)	unused_lib_feature_checking
time:   4.444; rss: 9510MB -> 9568MB (  +58MB)	crate_lints
time:  59.563; rss: 9568MB -> 9576MB (   +8MB)	module_lints
time:  64.006; rss: 9510MB -> 9576MB (  +66MB)	lint_checking
time:   4.127; rss: 9576MB -> 9639MB (  +62MB)	privacy_checking_modules
time:  77.984; rss: 9301MB -> 9639MB ( +337MB)	misc_checking_3
time:   0.311; rss: 10357MB -> 10357MB (   +0MB)	monomorphization_collector_root_collections
time:  14.051; rss: 10357MB -> 10573MB ( +217MB)	monomorphization_collector_graph_walk
time:   1.759; rss: 10573MB -> 10652MB (  +79MB)	partition_and_assert_distinct_symbols
time:  28.518; rss: 9639MB -> 10711MB (+1072MB)	generate_crate_metadata
time:   0.000; rss: 10711MB -> 10711MB (   +0MB)	find_cgu_reuse
time:  63.408; rss: 10711MB -> 12272MB (+1560MB)	codegen_to_LLVM_IR
time:  64.916; rss: 10711MB -> 12267MB (+1556MB)	codegen_crate
time:   0.000; rss: 12261MB -> 12261MB (   +0MB)	assert_dep_graph
time:   0.000; rss: 12261MB -> 12261MB (   +0MB)	check_dirty_clean
time:   0.664; rss: 12230MB -> 12210MB (  -20MB)	encode_query_results_for(rustc_query_impl::queries::type_of)
time:   2.111; rss: 12210MB -> 12043MB ( -167MB)	encode_query_results_for(rustc_query_impl::queries::generics_of)
time:   0.108; rss: 12043MB -> 12057MB (  +14MB)	encode_query_results_for(rustc_query_impl::queries::predicates_of)
time:   0.004; rss: 12057MB -> 12059MB (   +2MB)	encode_query_results_for(rustc_query_impl::queries::mir_const_qualif)
time:   0.665; rss: 12059MB -> 12121MB (  +62MB)	encode_query_results_for(rustc_query_impl::queries::mir_for_ctfe)
time:  16.149; rss: 12121MB -> 12148MB (  +28MB)	encode_query_results_for(rustc_query_impl::queries::optimized_mir)
time:   0.000; rss: 12148MB -> 12148MB (   +0MB)	encode_query_results_for(rustc_query_impl::queries::covered_file_name)
time:   0.000; rss: 12148MB -> 12148MB (   +0MB)	encode_query_results_for(rustc_query_impl::queries::covered_code_regions)
time:   0.010; rss: 12148MB -> 12150MB (   +2MB)	encode_query_results_for(rustc_query_impl::queries::promoted_mir)
time:   0.052; rss: 12150MB -> 12155MB (   +4MB)	encode_query_results_for(rustc_query_impl::queries::unsafety_check_result)
time:   0.003; rss: 12155MB -> 12156MB (   +1MB)	encode_query_results_for(rustc_query_impl::queries::thir_check_unsafety)
time:  11.428; rss: 12156MB -> 11748MB ( -408MB)	encode_query_results_for(rustc_query_impl::queries::typeck)
time:   0.000; rss: 11748MB -> 11748MB (   +0MB)	encode_query_results_for(rustc_query_impl::queries::diagnostic_only_typeck)
time:   0.094; rss: 11748MB -> 11756MB (   +8MB)	encode_query_results_for(rustc_query_impl::queries::used_trait_imports)
time:   0.272; rss: 11756MB -> 11778MB (  +22MB)	encode_query_results_for(rustc_query_impl::queries::mir_borrowck)
time:   0.054; rss: 11778MB -> 11778MB (   +0MB)	encode_query_results_for(rustc_query_impl::queries::eval_to_allocation_raw)
time:   0.005; rss: 11778MB -> 11779MB (   +1MB)	encode_query_results_for(rustc_query_impl::queries::eval_to_const_value_raw)
time:   0.021; rss: 11779MB -> 11784MB (   +5MB)	encode_query_results_for(rustc_query_impl::queries::check_match)
time:   0.041; rss: 11784MB -> 11786MB (   +2MB)	encode_query_results_for(rustc_query_impl::queries::symbol_name)
time:   0.743; rss: 11786MB -> 11815MB (  +29MB)	encode_query_results_for(rustc_query_impl::queries::codegen_fn_attrs)
time:   0.043; rss: 11815MB -> 11816MB (   +1MB)	encode_query_results_for(rustc_query_impl::queries::codegen_fulfill_obligation)
time:   0.674; rss: 11816MB -> 11840MB (  +25MB)	encode_query_results_for(rustc_query_impl::queries::specialization_graph_of)
time:   0.000; rss: 11840MB -> 11840MB (   +0MB)	encode_query_results_for(rustc_query_impl::queries::adt_drop_tys)
time:   0.000; rss: 11840MB -> 11840MB (   +0MB)	encode_query_results_for(rustc_query_impl::queries::adt_significant_drop_tys)
time:   0.005; rss: 11840MB -> 11841MB (   +1MB)	encode_query_results_for(rustc_query_impl::queries::unused_generic_params)
time:  33.153; rss: 12232MB -> 11841MB ( -390MB)	encode_query_results
time:  88.943; rss: 11955MB -> 11783MB ( -173MB)	LLVM_passes(crate)
time:  38.854; rss: 12259MB -> 10095MB (-2164MB)	incr_comp_serialize_result_cache
time:  39.030; rss: 12261MB -> 10095MB (-2166MB)	incr_comp_persist_result_cache
time:   0.000; rss: 10095MB -> 10095MB (   +0MB)	incr_comp_persist_dep_graph
time:  39.064; rss: 12257MB -> 10095MB (-2162MB)	serialize_dep_graph
time:  19.047; rss: 10095MB -> 10307MB ( +212MB)	free_global_ctxt
time:   0.000; rss: 10307MB -> 10307MB (   +0MB)	join_worker_thread
time:   0.519; rss: 10307MB -> 10307MB (   +0MB)	copy_all_cgu_workproducts_to_incr_comp_cache_dir
time:   0.522; rss: 10307MB -> 10307MB (   +0MB)	finish_ongoing_codegen
time:   0.000; rss: 10307MB -> 10307MB (   +0MB)	llvm_dump_timing_file
time:   0.002; rss: 10307MB -> 10307MB (   +0MB)	serialize_work_products
time:   0.001; rss: 9542MB -> 9542MB (   +0MB)	incr_comp_finalize_session_directory
time:   0.000; rss: 9542MB -> 9542MB (   +0MB)	link_binary_check_files_are_writeable
time:   7.835; rss: 9542MB -> 9544MB (   +2MB)	link_rlib
time:   0.000; rss: 9544MB -> 9544MB (   +0MB)	link_binary_remove_temps
time:   7.872; rss: 9542MB -> 9544MB (   +2MB)	link_binary
time:   7.944; rss: 9542MB -> 9201MB ( -341MB)	link_crate
time:   8.495; rss: 10307MB -> 9201MB (-1106MB)	link
time: 537.014; rss:   33MB -> 3715MB (+3682MB)	total
```

</details>

<details>
<summary>This PR (Click to Expand)</summary>

```
time:   2.379; rss:   51MB -> 1116MB (+1064MB)	parse_crate
time:   0.003; rss: 1116MB -> 1116MB (   +0MB)	attributes_injection
time:   0.002; rss: 1116MB -> 1116MB (   +0MB)	incr_comp_prepare_session_directory
time:   0.000; rss: 1116MB -> 1116MB (   +0MB)	incr_comp_garbage_collect_session_directories
time:   0.000; rss: 1116MB -> 1116MB (   +0MB)	plugin_loading
time:   0.000; rss: 1116MB -> 1116MB (   +0MB)	plugin_registration
time:   0.003; rss: 1118MB -> 1118MB (   +0MB)	crate_injection
time:  13.376; rss: 1118MB -> 3143MB (+2025MB)	expand_crate
time:   0.002; rss: 3143MB -> 3143MB (   +0MB)	check_unused_macros
time:  13.379; rss: 1118MB -> 3143MB (+2025MB)	macro_expand_crate
time:   0.002; rss: 3143MB -> 3143MB (   +0MB)	maybe_building_test_harness
time:   0.479; rss: 3143MB -> 3143MB (   +0MB)	AST_validation
time:   0.002; rss: 3143MB -> 3143MB (   +0MB)	maybe_create_a_macro_crate
time:   0.005; rss: 3143MB -> 3143MB (   +0MB)	finalize_imports
time:   0.520; rss: 3143MB -> 3125MB (  -18MB)	finalize_macro_resolutions
time:   4.446; rss: 3125MB -> 3577MB ( +453MB)	late_resolve_crate
time:   0.000; rss: 3577MB -> 3577MB (   +0MB)	resolve_main
time:   0.336; rss: 3577MB -> 3577MB (   +0MB)	resolve_check_unused
time:   0.000; rss: 3577MB -> 3577MB (   +0MB)	resolve_report_errors
time:   0.295; rss: 3577MB -> 3578MB (   +0MB)	resolve_postprocess
time:   5.602; rss: 3143MB -> 3578MB ( +435MB)	resolve_crate
time:   0.388; rss: 3578MB -> 3578MB (   +0MB)	complete_gated_feature_checking
time:  20.014; rss: 1116MB -> 3578MB (+2462MB)	configure_and_expand
time:   0.000; rss: 3578MB -> 3578MB (   +0MB)	prepare_outputs
time:   0.000; rss: 3578MB -> 3578MB (   +0MB)	blocked_on_dep_graph_loading
time:  64.219; rss: 3578MB -> 6313MB (+2736MB)	hir_lowering
time:   1.102; rss: 6313MB -> 6319MB (   +6MB)	early_lint_checks
time:   1.426; rss: 6319MB -> 6268MB (  -52MB)	drop_ast
time:   0.005; rss: 5834MB -> 5836MB (   +2MB)	setup_global_ctxt
time:   0.000; rss: 5838MB -> 5838MB (   +0MB)	looking_for_entry_point
time:   0.292; rss: 5838MB -> 5840MB (   +1MB)	looking_for_derive_registrar
time:   9.553; rss: 5838MB -> 6060MB ( +222MB)	misc_checking_1
time:   9.949; rss: 6060MB -> 6764MB ( +704MB)	type_collecting
time:   0.630; rss: 6764MB -> 6764MB (   +0MB)	impl_wf_inference
time:   0.060; rss: 6764MB -> 6764MB (   +0MB)	unsafety_checking
time:   3.054; rss: 6764MB -> 6787MB (  +23MB)	coherence_checking
time:  20.702; rss: 6787MB -> 7533MB ( +746MB)	wf_checking
time:   5.194; rss: 7533MB -> 7668MB ( +135MB)	item_types_checking
time:  74.677; rss: 7668MB -> 8062MB ( +394MB)	item_bodies_checking
time: 114.497; rss: 6060MB -> 8068MB (+2008MB)	type_check_crate
time:   1.891; rss: 8068MB -> 8072MB (   +4MB)	match_checking
time:   1.292; rss: 8072MB -> 8100MB (  +28MB)	liveness_and_intrinsic_checking
time:   3.183; rss: 8068MB -> 8100MB (  +32MB)	misc_checking_2
time:  68.845; rss: 8100MB -> 9279MB (+1179MB)	MIR_borrow_checking
time:   0.587; rss: 9279MB -> 9295MB (  +17MB)	MIR_effect_checking
time:   0.000; rss: 9295MB -> 9295MB (   +0MB)	layout_testing
time:   4.443; rss: 9377MB -> 9504MB ( +127MB)	death_checking
time:   0.034; rss: 9504MB -> 9504MB (   +0MB)	unused_lib_feature_checking
time:   4.409; rss: 9504MB -> 9562MB (  +58MB)	crate_lints
time:  56.490; rss: 9562MB -> 9571MB (   +8MB)	module_lints
time:  60.900; rss: 9504MB -> 9571MB (  +66MB)	lint_checking
time:   4.147; rss: 9571MB -> 9633MB (  +62MB)	privacy_checking_modules
time:  75.094; rss: 9295MB -> 9633MB ( +337MB)	misc_checking_3
time:   0.315; rss: 10357MB -> 10357MB (   +0MB)	monomorphization_collector_root_collections
time:  14.501; rss: 10357MB -> 10571MB ( +215MB)	monomorphization_collector_graph_walk
time:   1.763; rss: 10571MB -> 10661MB (  +89MB)	partition_and_assert_distinct_symbols
time:  29.035; rss: 9633MB -> 10706MB (+1073MB)	generate_crate_metadata
time:   0.000; rss: 10706MB -> 10706MB (   +0MB)	find_cgu_reuse
time:  30.913; rss: 10706MB -> 12150MB (+1444MB)	codegen_to_LLVM_IR
time:  31.108; rss: 10706MB -> 12150MB (+1444MB)	codegen_crate
time:   0.000; rss: 12150MB -> 12150MB (   +0MB)	assert_dep_graph
time:   0.000; rss: 12150MB -> 12150MB (   +0MB)	check_dirty_clean
time:   0.416; rss: 12152MB -> 12199MB (  +46MB)	encode_query_results_for(rustc_query_impl::queries::type_of)
time:   1.259; rss: 12199MB -> 12211MB (  +12MB)	encode_query_results_for(rustc_query_impl::queries::generics_of)
time:   0.095; rss: 12211MB -> 12193MB (  -18MB)	encode_query_results_for(rustc_query_impl::queries::predicates_of)
time:   0.005; rss: 12193MB -> 12195MB (   +2MB)	encode_query_results_for(rustc_query_impl::queries::mir_const_qualif)
time:   0.828; rss: 12195MB -> 12208MB (  +14MB)	encode_query_results_for(rustc_query_impl::queries::mir_for_ctfe)
time:  17.880; rss: 12208MB -> 11987MB ( -222MB)	encode_query_results_for(rustc_query_impl::queries::optimized_mir)
time:   0.000; rss: 11987MB -> 11987MB (   +0MB)	encode_query_results_for(rustc_query_impl::queries::covered_file_name)
time:   0.000; rss: 11987MB -> 11987MB (   +0MB)	encode_query_results_for(rustc_query_impl::queries::covered_code_regions)
time:   0.007; rss: 11987MB -> 11988MB (   +1MB)	encode_query_results_for(rustc_query_impl::queries::promoted_mir)
time:   0.049; rss: 11988MB -> 11992MB (   +4MB)	encode_query_results_for(rustc_query_impl::queries::unsafety_check_result)
time:   0.002; rss: 11992MB -> 11994MB (   +1MB)	encode_query_results_for(rustc_query_impl::queries::thir_check_unsafety)
time:  38.049; rss: 11994MB -> 12093MB (  +99MB)	encode_query_results_for(rustc_query_impl::queries::typeck)
time:   0.000; rss: 12093MB -> 12093MB (   +0MB)	encode_query_results_for(rustc_query_impl::queries::diagnostic_only_typeck)
time:   0.024; rss: 12093MB -> 12095MB (   +2MB)	encode_query_results_for(rustc_query_impl::queries::used_trait_imports)
time:   0.372; rss: 12095MB -> 12053MB (  -42MB)	encode_query_results_for(rustc_query_impl::queries::mir_borrowck)
time:   0.015; rss: 12053MB -> 12053MB (   +0MB)	encode_query_results_for(rustc_query_impl::queries::eval_to_allocation_raw)
time:   0.005; rss: 12053MB -> 12054MB (   +1MB)	encode_query_results_for(rustc_query_impl::queries::eval_to_const_value_raw)
time:   0.003; rss: 12054MB -> 12056MB (   +2MB)	encode_query_results_for(rustc_query_impl::queries::check_match)
time:   0.037; rss: 12056MB -> 11899MB ( -157MB)	encode_query_results_for(rustc_query_impl::queries::symbol_name)
time:   0.667; rss: 11899MB -> 11708MB ( -191MB)	encode_query_results_for(rustc_query_impl::queries::codegen_fn_attrs)
time:   0.045; rss: 11708MB -> 11709MB (   +1MB)	encode_query_results_for(rustc_query_impl::queries::codegen_fulfill_obligation)
time:   0.295; rss: 11709MB -> 11734MB (  +25MB)	encode_query_results_for(rustc_query_impl::queries::specialization_graph_of)
time:   0.000; rss: 11734MB -> 11734MB (   +0MB)	encode_query_results_for(rustc_query_impl::queries::adt_drop_tys)
time:   0.000; rss: 11734MB -> 11734MB (   +0MB)	encode_query_results_for(rustc_query_impl::queries::adt_significant_drop_tys)
time:   0.005; rss: 11734MB -> 11734MB (   +1MB)	encode_query_results_for(rustc_query_impl::queries::unused_generic_params)
time:  60.063; rss: 12152MB -> 11734MB ( -418MB)	encode_query_results
time:  76.745; rss: 12007MB -> 11699MB ( -308MB)	LLVM_passes(crate)
time:  61.634; rss: 12150MB -> 10557MB (-1593MB)	incr_comp_serialize_result_cache
time:  61.637; rss: 12150MB -> 10557MB (-1593MB)	incr_comp_persist_result_cache
time:   0.001; rss: 10557MB -> 10557MB (   +0MB)	incr_comp_persist_dep_graph
time:  61.641; rss: 12150MB -> 10557MB (-1593MB)	serialize_dep_graph
time:  15.601; rss: 10557MB -> 10242MB ( -315MB)	free_global_ctxt
time:   0.000; rss: 10242MB -> 10242MB (   +0MB)	join_worker_thread
time:   0.368; rss: 10242MB -> 10242MB (   +0MB)	copy_all_cgu_workproducts_to_incr_comp_cache_dir
time:   0.375; rss: 10242MB -> 10242MB (   +0MB)	finish_ongoing_codegen
time:   0.000; rss: 10242MB -> 10242MB (   +0MB)	llvm_dump_timing_file
time:   0.002; rss: 10242MB -> 10242MB (   +0MB)	serialize_work_products
time:   0.001; rss: 9668MB -> 9668MB (   +0MB)	incr_comp_finalize_session_directory
time:   0.000; rss: 9668MB -> 9668MB (   +0MB)	link_binary_check_files_are_writeable
time:   1.469; rss: 9668MB -> 9671MB (   +3MB)	link_rlib
time:   0.000; rss: 9671MB -> 9671MB (   +0MB)	link_binary_remove_temps
time:   1.506; rss: 9668MB -> 9671MB (   +3MB)	link_binary
time:   1.622; rss: 9668MB -> 9329MB ( -339MB)	link_crate
time:   2.037; rss: 10242MB -> 9329MB ( -913MB)	link
time: 502.990; rss:   32MB -> 5888MB (+5855MB)	total
```

</details>

(6.34% decrease in runtime, results are consistent across multiple runs)

graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,graydon/rust