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

[Vassil Vassilev via cfe-commits]

vgvassilev wrote:

> Processing just header is also much faster than a full build and I think it would only have to run on changed headers and source files for a PR.

Any ideas how to implement that check? If we have a draft implementation we can check with the the ci folks how to deploy it...

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