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Commit 1ee696d8 authored by Dan Gohman's avatar Dan Gohman
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Instcombine's ShrinkDemandedConstant may strip bits out of constants, 

obscuring what would otherwise be a low-bits mask.  Use ComputeMaskedBits
to compute what ShrinkDemandedConstant knew about to reconstruct a
low-bits mask value.

llvm-svn: 73540
parent 0d9730f3
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