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255d8919b6
This allows us to simplify on conditions where bits are not known, but they are not demanded either! This also fixes a couple of bugs in ComputeMaskedBits that were exposed during this work. In the future, swaths of instcombine should be removed, as this code subsumes a bunch of ad-hockery. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26122 91177308-0d34-0410-b5e6-96231b3b80d8
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