[PATCH] D147568: [InstCombine] Preserve nsw/nuw flags in canonicalization

[Eric Gullufsen via Phabricator via llvm-commits]

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canonicalizeLogicFirst reorders logic op / math op for suitable
constants, and this commit makes this function pass through
nsw/nuw flags on the Add.

I don't have links to every combination of flag + logic op, but I have used alive-tv to verify all combos

Alive2 verification for add, or -> or, add where add has nuw and nsw flags <https://alive2.llvm.org/ce/z/JCZajo>
Alive2 verification for add, xor -> xor, add where add has just nsw <https://alive2.llvm.org/ce/z/eixEAB>
Alive2 verification for add, and -> and, add where add has just nuw <https://alive2.llvm.org/ce/z/37zf54>


https://reviews.llvm.org/D147568

Files:
  llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
  llvm/test/Transforms/InstCombine/and-xor-or.ll

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