Revert "thread-local caches?"
Revert "thread-local caches?"

This reverts commit 0c9995dc513fe0b18144695a28d0cd89f73b80e1.

Reason for revert:

Breaks G3 --config=ios_armv7.  Others seem ok?

third_party/skia/HEAD/src/core/SkVMBlitter.cpp:47:9: error: thread-local storage is not supported for the current target
        thread_local static auto* cache = new SkLRUCache<Key, skvm::Program>{8};


Original change's description:
> thread-local caches?
> 
> Here's another idea... these SkVMBlitter program caches are probably
> best thread-local.  If there are a bunch of threads doing the same work
> with the same program, we don't need them fighting over that one slot in
> the cache, and if there are a bunch of threads doing _different_ work,
> they'll get the best cache behavior if they don't fight over slots in
> the LRU with different programs.  Either way, seems like a win?
> 
> (I've kept the try-acquire/release pattern just to make the focus of
> this change more clear.  We can fold it through more if we like it.)
> 
> Change-Id: Ib1ee270069c48446845ce27225652896661c5dfe
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/233060
> Commit-Queue: Mike Klein <14574f09dfa9b4e14759b88c3426a495a0e627b0@google.com>
> Reviewed-by: Herb Derby <herb@google.com>

TBR=14574f09dfa9b4e14759b88c3426a495a0e627b0@google.com,herb@google.com,reed@google.com

Change-Id: Ie93593490d793645492b6e964632c1e71b3e3ea6
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/233236
Reviewed-by: Mike Klein <14574f09dfa9b4e14759b88c3426a495a0e627b0@google.com>
Commit-Queue: Mike Klein <14574f09dfa9b4e14759b88c3426a495a0e627b0@google.com>

google/skia,HalCanary/skia-hc,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,HalCanary/skia-hc,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,HalCanary/skia-hc,aosp-mirror/platform_external_skia,google/skia,HalCanary/skia-hc,google/skia,HalCanary/skia-hc,HalCanary/skia-hc,aosp-mirror/platform_external_skia,google/skia,HalCanary/skia-hc,HalCanary/skia-hc,aosp-mirror/platform_external_skia,HalCanary/skia-hc,HalCanary/skia-hc,google/skia