[InstCombine] Fold zero check followed by decrement to usub.sat
Fold (a == 0) : 0 ? a - 1 into usub.sat(a, 1). Differential Revision: https://reviews.llvm.org/D140798
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Fold (a == 0) : 0 ? a - 1 into usub.sat(a, 1). Differential Revision: https://reviews.llvm.org/D140798