[PATCH] D157801: [ValueTracking] Use predicates for incoming phi-edges to deduce non-zero

[Noah Goldstein via Phabricator via llvm-commits]

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This is basically a copy and paste of the same logic we do in
`computeKnownBits` but adapts it for just `isKnownNonZero`.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D157801

Files:
  llvm/lib/Analysis/ValueTracking.cpp
  llvm/test/Analysis/ValueTracking/phi-known-nonzero.ll
  llvm/test/Transforms/FunctionAttrs/nonnull.ll
  llvm/test/Transforms/JumpThreading/phi-known.ll

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