[PATCH] D158904: AMDGPU: Don't require all flags to expand fast powr

[Matt Arsenault via Phabricator via llvm-commits]

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This was requiring all fast math flags, which is practically
useless. This wouldn't fire using all the standard OpenCL fast math
flags. This only needs afn nnan and ninf.


https://reviews.llvm.org/D158904

Files:
  llvm/lib/Target/AMDGPU/AMDGPULibCalls.cpp
  llvm/test/CodeGen/AMDGPU/amdgpu-simplify-libcall-pown.ll
  llvm/test/CodeGen/AMDGPU/amdgpu-simplify-libcall-powr.ll

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