[PATCH] D27584: AMDGPU: Improve nsw/nuw/exact when promoting uniform i16 ops

[Matt Arsenault via Phabricator via llvm-commits]

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These were simply preserving the flags of the original operation,
which was too conservative in most cases and incorrect for mul.

      

nsw/nuw may be needed for some combines to cleanup messes when
 intermediate sext_inregs are introduced later.

      

Tested valid combinations with alive.


https://reviews.llvm.org/D27584

Files:
  lib/Target/AMDGPU/AMDGPUCodeGenPrepare.cpp
  test/CodeGen/AMDGPU/amdgpu-codegenprepare-i16-to-i32.ll

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