[libclang] Add API to query more information about base classes. (#120300) The first API is clang_visitCXXBaseClasses: this allows visiting the base classes without going through the generic child visitor (which is awkward, and doesn't work for template instantiations). The second API is clang_getOffsetOfBase; this allows computing the offset of a base in the class layout, the same way clang_Cursor_getOffsetOfField computes the offset of a field. Also, add a Python binding for the existing function clang_isVirtualBase.
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