[llvm] [NFC][AArch64] Refactor AArch64LoopIdiomTransform in preparation for more idioms (PR #78471)

[via llvm-commits]

shaojingzhi wrote:

Hi, I'm interested in this pattern too, and I wonder that when would you plan to finish this pattern match? Would you just recognize this pattern and transform it to the original while loop IR and do the following transform reusing the original code, or would you like to write something new for this pattern? 

https://github.com/llvm/llvm-project/pull/78471