[clang] [libclang] Add API to query more information about base classes. (PR #120300)

[Jannick Kremer via cfe-commits]

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

Re Python: LGTM!

On a sidenote just fyi, there's no need to amend & forcepush when you adress review comments. I know the contributor guide says something about how you should have only a single commit when submitting a patch, but that goes only for the initial thing (I got confused by this at the start). We squash on merge anyways. 

https://github.com/llvm/llvm-project/pull/120300