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

[Sjoerd Meijer via llvm-commits]

sjoerdmeijer wrote:

Dave suggested this in https://github.com/llvm/llvm-project/pull/72273, and I agree that this seems a very sensible approach.

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