[llvm] [AIX][TLS] Produce a faster local-exec access sequence for the "aix-small-tls" global variable attribute (PR #83053)

[Felix via llvm-commits]

orcguru wrote:

After a second thought, I think those questions are outside of current patch's scope. This patch looks good to me!

https://github.com/llvm/llvm-project/pull/83053