[DAG] computeKnownBits - abds(x, y) will be zero in the upper bits if x and y are sign-extended (#94448) As reported on #94442 - if x and y have more than one signbit, then the upper bits of its absolute value are guaranteed to be zero Sibling PR to #94382 Alive2: https://alive2.llvm.org/ce/z/7_z2Vc Fixes #94442
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