[PATCH] D144759: [AMDGPU] Implement idempotent atomic lowering

[Stanislav Mekhanoshin via Phabricator via llvm-commits]

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This turns an idempotent atomic operation into an atomic load.

Fixes: SWDEV-385135


https://reviews.llvm.org/D144759

Files:
  llvm/lib/Target/AMDGPU/SIISelLowering.cpp
  llvm/lib/Target/AMDGPU/SIISelLowering.h
  llvm/test/CodeGen/AMDGPU/idemponent-atomics.ll

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