David Majnemer 7d0e99c601 [InstCombine] Use a more targeted fix instead of r235544 ...

Only clear out the NSW/NUW flags if we are optimizing 'add'/'sub' while
taking advantage that the sign bit is not set.  We do this optimization
to further shrink the mask but shrinking the mask isn't NSW/NUW
preserving in this case.

llvm-svn: 235558

2015-04-22 22:42:05 +00:00

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