[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 #84132. I will work on that part, and will update later.

I'm not able to show the interworking part directly in this patch, so I created private branch and show the change there:
https://github.com/orcguru/llvm-project/commit/a173d2427f12d844aa03c9cf9f0834bb184deff6

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