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

[Hubert Tong via cfe-commits]

hubert-reinterpretcast wrote:

> it's always better to internalize than not

@w2yehia, can you expand on the benefits of using internal linkage so it can be compared against the possibility of deduplication as enabled by weak_odr linkage?

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