[InstCombine] Fold Ext(i1) Pred shr(A, BW - 1) => i1 Pred A s< 0 (#68244)
Resolves #67916 . This patch folds `Ext(icmp (A, xxx)) Pred shr(A, BW - 1)` into `i1 Pred A s< 0`. [Alive2](https://alive2.llvm.org/ce/z/k53Xwa).
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d2aa523f
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