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

[Tom Stellard via llvm-commits]

tstellar wrote:

> It looks like this statement is necessary for Phase 2 on AIX as well. Should I just remove the `-o $Phase" == "1"` part of the condition then?

That seems OK to me.

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