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

[Tom Stellard via cfe-commits]

tstellar wrote:

Is there any reason why the tool should be in the monorepo and not some other repository?

Also, as for keeping the annotations up-to-date.  My recommendation is to add a github action job that runs the ids tool and then submits a pull request for any necessary changes.   We could run it automatically once a day to start.

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