[llvm] [AArch64][GlobalISel] Prefer DUPLANE to REV (PR #142725)

[David Green via llvm-commits]

davemgreen wrote:

> seems to have made thing slightly worse in @shufflevector_v3p0 where there's now an extra inst (DUP), but overall seems like an improvement. I dont think the title is accurate though? It's not just REV it prefers DUPLANE over now

Yeah shufflevector_v3p0 is quite far away from where it should be, compared to the SDAG version.

https://github.com/llvm/llvm-project/pull/142725