[llvm] [PowerPC][AIX] Enable aix-small-local-dynamic-tls target attribute without folding opt (PR #86641)

[Felix via llvm-commits]

orcguru wrote:

There will be some interactions between this patch and https://github.com/llvm/llvm-project/pull/84132. I will work on that part, and will update later.

https://github.com/llvm/llvm-project/pull/86641