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Commit 7cfd4a9d authored by Craig Topper's avatar Craig Topper
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[ValueTracking] Remove deadish code from computeKnownBitsAddSub. 

The code assigned to KnownZero, but later code unconditionally assigned over it. I'm pretty sure the later code can handle the same cases and more equally well.

llvm-svn: 298190
parent e4e17b8c
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