[llvm-bugs] [Bug 234278] [clang] `combineShiftToPMULH`: `lshr(mul(sext a, sext b), 16)` on i64 lanes becomes `zext(pmulhw)`, dropping the sign bits of negative products (miscompile from C, `-O1`+)

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Wed Oct 21 09:49:48 PDT 2026

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