clang/llvm: Upgrade to 12.0.0 RC3
clang/llvm: Upgrade to 12.0.0 RC3

* 15d1ee36720f [CMake][compiler-rt] Use copying instead of symlinking for LSE builtins on non-Unix-likes
* bff59aca162e [TargetLowering] Use HandleSDNodes to prevent nodes from being deleted by recursive calls in getNegatedExpression.
* a123beacce40 [LoopVectorize] Fix VPRecipeBuilder::createEdgeMask to correctly generate the mask
* f8b32989241c [clang-tidy] Deprecate readability-deleted-default check
* 46a1b0655666 [AArch64] Legalize horizontal fmax/fmin reductions on f16 vectors
* d24e102ba266 [OpenMP] Fixed a crash when offloading to x86_64 with target nowait
* 52510d84802b [GlobalISel] Bail on G_PHI narrowing of odd types (PR48188)
* 99350dcc3f5b [OpenMP] Fix clang-cl build error regarding TSX intrinsics
* 4ed9f17e9390 [analyzer] Add 12.0.0 release notes
* 9760b282ff03 [DAGCombiner][X86] Don't peek through ANDs on the shift amount in matchRotateSub when called from MatchFunnelPosNeg.
* 344216979213 Revert "[c++20] Mark class type NTTPs as done and start defining the feature test macro."
* f73ba0f3582b [SimplifyCFG] avoid illegal phi with both poison and undef
* 692808e5af83 [InstCombine] avoid infinite loop in demanded bits for select
* c637d4d136fd [OpenMP][NVPTX] Fixed a compilation error in deviceRTLs caused by unsupported feature in release verion of LLVM
* 98f06b16a313 [AArch64][Docs] Release notes 12.x on outline atomics
* e0e6b1e39e7e ReleaseNotes: add lld/ELF notes

Signed-off-by: Khem Raj <729d64b6f67515e258459a5f6d20ec88b2caf8df@gmail.com>

kraj/meta-clang,kraj/meta-clang,kraj/meta-clang