[llvm] [PowerPC] Support local-dynamic TLS relocation on AIX (PR #66316)

[Kai Luo via llvm-commits]

bzEq wrote:

> I tried to parallelize the review effort, but github didn't show the delta for me: https://github.com/llvm/llvm-project/pull/66972

Let's include FE change in this PR.

https://github.com/llvm/llvm-project/pull/66316