[InstCombine] fold inc-of-signbit-splat to not+lshr
(iN X s>> (N - 1)) + 1 --> (~X) u>> (N - 1) https://alive2.llvm.org/ce/z/wzS474
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(iN X s>> (N - 1)) + 1 --> (~X) u>> (N - 1) https://alive2.llvm.org/ce/z/wzS474