[llvm] [AA] Move Target Specific AA before BasicAA (PR #125965)

[via llvm-commits]

Chengjunp wrote:

Thanks @dtcxzyw. I have just made two PRs for [AMDGPUAA](https://github.com/llvm/llvm-project/pull/128116) and [FlattenCFG](https://github.com/llvm/llvm-project/pull/128117). I will update this PR once those two get merged. 

I will also attached internal benchmarks if I can get the permission.

https://github.com/llvm/llvm-project/pull/125965