[PATCH] D159056: [InstCombine] Make `isFreeToInvert` check recursively.

[Noah Goldstein via Phabricator via llvm-commits]

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Some Instructions (select/min/max) are inverted by just inverting the
operands. So the answer of whether they are free to invert is really
just whether the operands are free to invert.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D159056

Files:
  llvm/include/llvm/Transforms/InstCombine/InstCombiner.h
  llvm/test/Transforms/InstCombine/minmax-intrinsics.ll
  llvm/test/Transforms/InstCombine/pr63791.ll
  llvm/test/Transforms/LoopVectorize/reduction-inloop.ll

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