[llvm] [AArch64] Add MATCH loops to LoopIdiomVectorizePass (PR #101976)

[Ricardo Jesus via llvm-commits]

rj-jesus wrote:

Many thanks for the comments, @david-arm. I've tidied up the tests and added the checks for loop invariance (though I think they are redundant given how the IR is matched before, but in any case). Please let me know if that's what you had in mind and if you have any other comments. :)

https://github.com/llvm/llvm-project/pull/101976