[PATCH] InstCombineSimplifyDemanded: Remove nsw/nuw flags when optimizing demanded bits

[Phabricator]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D9415

Files:
  llvm/trunk/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp
  llvm/trunk/test/Transforms/InstCombine/demand_shrink_nsw.ll

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