[clang] Clang tooling generated visibility macros for Clang (PR #109702)

[Eli Friedman via cfe-commits]

efriedma-quic wrote:

Is there a plan for maintaining these annotations long-term?  Like, should there be a pre-commit action to verify that all the annotations are up-to-date?

https://github.com/llvm/llvm-project/pull/109702