[clang] [clang-tools-extra] [llvm] [AArch64] Add an AArch64 pass for loop idiom transformations (PR #72273)

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shaojingzhi wrote:

Hi! I wonder that have you conducted any tests to determine the potential performance increase of this pass in the SPEC2017 557xz benchmark? I attempted to apply it to the xz benchmark, but only one copy(--copies=1) demonstrated a significant increase(about 3%), but there was no increase when I set --copies=128 or higher. Do you have any suggestions or test results that you could share?

https://github.com/llvm/llvm-project/pull/72273