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Commit 3a48b87c authored by Duncan Sands's avatar Duncan Sands
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Fix PR6165. The bug was that LHSKnownZero was being and'd with DemandedMask 

when it should have been and'd with LowBits.  Fix that and while there beef
up the logic in the case of a negative LHS.

llvm-svn: 94745
parent 2cb94164
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