[PATCH] D121172: [AMDGPU] Set noclobber metadata on loads instead of cast to constant

[Stanislav Mekhanoshin via Phabricator via llvm-commits]

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A load via pointer cast to constant will return true from
pointsToConstantMemory which is not necessarily so.

Fixes: SWDEV-326463


https://reviews.llvm.org/D121172

Files:
  clang/test/CodeGenCUDA/amdgpu-kernel-arg-pointer-type.cu
  llvm/lib/Target/AMDGPU/AMDGPUPromoteKernelArguments.cpp
  llvm/test/CodeGen/AMDGPU/promote-kernel-arguments.ll

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