[llvm] [Release] Install compiler-rt builtins during Phase 1 on AIX (PR #81485)

[Hubert Tong via llvm-commits]

https://github.com/hubert-reinterpretcast commented:

I have reviewed this and have no comments at this time. I agree that rationale for the status quo difference between Phase 1 and Phase 2 does not appear to be explained.

https://github.com/llvm/llvm-project/pull/81485