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[DAG] computeKnownBits - abs(x) will be zero in the upper bits if x i…
…s sign-extended (llvm#94382) As reported on llvm#94344 - if x has more than one signbit, then the upper bits of its absolute value are guaranteed to be zero Alive2: https://alive2.llvm.org/ce/z/a87fHU Fixes llvm#94344
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