[llvm] [AIX][TLS] Optimize the small local-exec access sequence for non-zero offsets (PR #71485)

[via llvm-commits]

https://github.com/stephenpeckham commented:

Other than a couple of nits, I think the code and the generated assembly look good.  Factoring out the +/- 65536 in the assemble code helps anyone reading the the assembly listing.

https://github.com/llvm/llvm-project/pull/71485