[llvm] [clang] [PowerPC] AIX TLS allow per function configuration of initial-exec or local-dynamic model (PR #79968)

[Amy Kwan via cfe-commits]

https://github.com/amy-kwan commented:

Since this patch relies on the local-dynamic patch, I think the local-dynamic changes are already in here, right? Do we know if there is a way yet to make dependent pull requests, just so reviewing this patch may be a bit easier when the local-dynamic changes are separate?

https://github.com/llvm/llvm-project/pull/79968