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2bb2ea8105
SimplifyDemandedBits was "simplifying" a constant by removing just sign bits. This caused a canonicalization race between different parts of instcombine. Fix and regression test added - third time lucky? git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237539 91177308-0d34-0410-b5e6-96231b3b80d8
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