llvm-project

2c434796 - [AArch64] Fix op mask detection in performZExtDeinterleaveShuffleCombine (#126054)

[AArch64] Fix op mask detection in performZExtDeinterleaveShuffleCombine (#126054) Given a zext from an extract vector, with a shuffle mask like <4, 0, 0, 4> we would previously recognize the top half as a deinterleave. In order to convert into a uzp we should have been checking that the bottom half is also poison. Fixes #125989