[llvm] [AArch64] Combine signext_inreg of setcc(... != splat(0)) (PR #157665)

[David Sherwood via llvm-commits]

https://github.com/david-arm approved this pull request.

LGTM! Seems like there are some potential lowering improvements we can make in future where fixed-width operations such as AND of an immediate can actually make use of SVE's immediate instructions.

https://github.com/llvm/llvm-project/pull/157665