[InstCombine] Fold (X << Y) / (X << Z) -> 1 << Y >> Z (#68863)
Resolve #68857. Alive2 proofs: [Whole proofs](https://alive2.llvm.org/ce/z/A5b85F)
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Resolve #68857. Alive2 proofs: [Whole proofs](https://alive2.llvm.org/ce/z/A5b85F)