[llvm] [AArch64] Enable AArch64 loop idiom transform pass (PR #77480)

[Sjoerd Meijer via llvm-commits]

https://github.com/sjoerdmeijer approved this pull request.

Dave was 1 second earlier, but here's my LGTM too ;-)

https://github.com/llvm/llvm-project/pull/77480