[clang] [llvm] [PowerPC] Tune AIX shared library TLS model at function level by heuristic (PR #84132)

[Amy Kwan via cfe-commits]

https://github.com/amy-kwan approved this pull request.

Thank you for addressing my comment!
I think I do not have any further comments, so unless if anyone has any other comments LGTM.

https://github.com/llvm/llvm-project/pull/84132