[clang] [llvm] [LTO][AIX] Add ThinLTO support for #pragma comment(copyright, ...) (PR #199398)

[Tony Varghese via cfe-commits]

tonykuttai wrote:

This change is being merged with [[PowerPC][AIX] Support #pragma comment copyright for AIX](https://github.com/llvm/llvm-project/pull/178184#top). Hence closing this PR.

https://github.com/llvm/llvm-project/pull/199398