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Commit ba0a6cab authored by Rafael Espindola's avatar Rafael Espindola
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Always compute all the bits in ComputeMaskedBits. 

This allows us to keep passing reduced masks to SimplifyDemandedBits, but
know about all the bits if SimplifyDemandedBits fails. This allows instcombine
to simplify cases like the one in the included testcase.

llvm-svn: 154011
parent 74875e67
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