[PATCH] D27906: InstCombine: Add fma + fabs/fneg transforms

[Matt Arsenault via Phabricator via llvm-commits]

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fma (fneg x), (fneg y), z -> fma x, y, z
fma (fabs x), (fabs x), z -> fma x, x, z


https://reviews.llvm.org/D27906

Files:
  lib/Transforms/InstCombine/InstCombineCalls.cpp
  test/CodeGen/AMDGPU/fma.ll
  test/Transforms/InstCombine/fma.ll

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