[PATCH] D157309: [ValueTracking] Do more thorough non-zero check in `isKnownToBePowerOfTwo` when `OrZero` is no set.

[Noah Goldstein via Phabricator via llvm-commits]

goldstein.w.n created this revision.
goldstein.w.n added reviewers: nikic, Allen.
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We can cover more cases by directly checking if the result is
known-nonzero for common patterns when they are missing `OrZero`.

This patch add `isKnownNonZero` checks for `shl`, `lshr`, `and`, and `mul`.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D157309

Files:
  llvm/lib/Analysis/ValueTracking.cpp
  llvm/test/Analysis/ValueTracking/known-power-of-two.ll
  llvm/test/Transforms/InstSimplify/ctpop-pow2.ll

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