[PATCH] D149423: [ValueTracking] Use knownbits interface for determining if `div`/`rem` are safe to speculate

[Noah Goldstein via Phabricator via llvm-commits]

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This just replaces the exact constant requirements with known-bits
which can prove better results.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D149423

Files:
  llvm/lib/Analysis/ValueTracking.cpp
  llvm/test/Analysis/ValueTracking/speculate-div.ll

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