[clang] [Clang] Allow the use of [[gnu::visibility]] with #pragma clang attribute (PR #145653)

[Erich Keane via cfe-commits]

https://github.com/erichkeane approved this pull request.

I don't see a reason to not do this, and if it makes the library simpler, even better.  I think you fixed the pre-commit CI now, so LGTM.

https://github.com/llvm/llvm-project/pull/145653