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

[Trevor Laughlin via cfe-commits]

trelau wrote:

Just referencing https://github.com/llvm/llvm-project/issues/121502 since this PR seem somewhat related (making it easier to iterate over things and pointed out it doesn't work for template instantiations, which might be the underlying problem I encountered).

I'd like to keep using libclang (and its Python bindings), so if there is a new API that could be added to libclang or a modification somewhere that is obvious, let me know and I'll see if I can make an attempt at it.

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