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

[Felix via llvm-commits]

orcguru wrote:

> > I tried to parallelize the review effort, but github didn't show the delta for me: #66972
> 
> Let's include FE change in this PR.

Thanks! Added clang change.

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