[InstCombine] Clang failed to fold (-a + b) / (a - b) into -1 due to the lack of nsw flag. #72119

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[InstCombine] Clang failed to fold (-a + b) / (a - b) into -1 due to the lack of nsw flag.#72119

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llvm:instcombinemissed-optimization

Alive2: https://alive2.llvm.org/ce/z/tPAt3K

godbolt: https://godbolt.org/z/1xhv9afKj

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llvm:instcombinemissed-optimization

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