[llvm-bugs] [Bug 238713] [SystemZ] lowerSIGN_EXTEND_VECTOR_INREG folds a shuffle whose sign-extended lanes come from the second operand into UNPACKs of the first operand: `__builtin_convertvector(__builtin_shufflevector(a, b, 22, 23, ...), long16)` extends a[14], a[15]

[LLVM Bugs via llvm-bugs]

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