[PATCH] D141990: [InstCombine] Add transform ctpop(X) -> 1 iff X is non-zero power of 2

[Noah Goldstein via Phabricator via llvm-commits]

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Definitionally a non-zero power of 2 will only have 1 bit set so this
is a freebee.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D141990

Files:
  llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
  llvm/test/Transforms/InstCombine/ctpop-pow2.ll

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