[PATCH] D29729: [InstCombine] don't lose nsw/nuw from add by converting to xor

[Eli Friedman via Phabricator via llvm-commits]

efriedma added a comment.

instcombine is allowed to use nsw to permit transformations which would otherwise be illegal.  instcombine should not avoid transformations for fear of dropping nsw or other metadata.


https://reviews.llvm.org/D29729