[PATCH] D112675: [Instcombine] Add patterns to generate fneg(fabs(x)) instead of fcmp/sub/selects (part 1)

[Usman Nadeem via Phabricator via llvm-commits]

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https://alive2.llvm.org/ce/z/L5DmiE

TODO: handle <=, >, and >=


https://reviews.llvm.org/D112675

Files:
  llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp
  llvm/test/Transforms/InstCombine/fneg-fabs.ll

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