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3bd87826e5
An nsw/nuw operation relies on the values feeding into it to not overflow if 'poison' is not to be produced. This means that optimizations which make modifications to the bottom of a chain (like SimplifyDemandedBits) must strip out nsw/nuw if they cannot ensure that they will be preserved. This fixes PR23309. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235544 91177308-0d34-0410-b5e6-96231b3b80d8
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