[PATCH] D149417: [ValueTracking] Add logic for `isKnownNonZero(smin/smax X, Y)`

[Noah Goldstein via Phabricator via llvm-commits]

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For `smin` if either `X` or `Y` is negative, the result is non-zero.
For `smax` if either `X` or `Y` is strictly positive, the result is
non-zero.

For both if `X != 0` and `Y != 0` the result is non-zero.

Alive2 Link:

  https://alive2.llvm.org/ce/z/7yvbgN
  https://alive2.llvm.org/ce/z/zizbvq


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D149417

Files:
  llvm/lib/Analysis/ValueTracking.cpp
  llvm/test/Analysis/ValueTracking/known-non-zero.ll
  llvm/test/Transforms/LoopVectorize/X86/float-induction-x86.ll
  llvm/test/Transforms/LoopVectorize/induction.ll
  llvm/test/Transforms/LoopVectorize/interleaved-accesses.ll
  llvm/test/Transforms/LoopVectorize/loop-scalars.ll

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