[llvm] [InstCombine] Fold zext(i1) == lshr(A, BW - 1) => i1 == A s< 0 (PR #68244)

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Fri Oct 6 19:35:35 PDT 2023

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https://github.com/XChy edited https://github.com/llvm/llvm-project/pull/68244

Previous message: [llvm] [InstCombine] Fold zext(icmp (A, xxx)) == shr(A, BW - 1) => not(trunc(xor(zext(icmp), shl))) (PR #68244)
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