[PATCH] [CodeGen] Annotate signed shift lefts with NUW

[Chandler Carruth]

This doesn't seem correct for a negative LHS where we only shift out 1s -- I think that should be valid.

Essentially, we seem to have a strange circumstance here where NUW as specified is not a subset of the restrictions of NSW.


http://reviews.llvm.org/D8899

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