[PATCH] D149199: [SelectionDAG] Fill in some more cases in `isKnownNeverZero`

[Noah Goldstein via Phabricator via llvm-commits]

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This mostly copies cases that already exist in ValueTracking, although
it skips the more complex ones. Those can be filled in as needed.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D149199

Files:
  llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
  llvm/test/CodeGen/AMDGPU/cttz_zero_undef.ll
  llvm/test/CodeGen/X86/divrem-by-select.ll

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