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Commit bf0002e7 authored by Dan Gohman's avatar Dan Gohman
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Teach ValueTracking a new way to analyze PHI nodes, and and teach 

Instcombine to be more aggressive about using SimplifyDemandedBits
on shift nodes. This allows a shift to be simplified to zero in the
included test case.

llvm-svn: 72204
parent a6bed837
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