[CodeGen] Fix TBAA info for accesses to members of base classes Resolves: Bug 35724 - regression (r315984): fatal error: error in backend: Broken function found (Did not see access type in access path!) https://bugs.llvm.org/show_bug.cgi?id=35724 Differential Revision: https://reviews.llvm.org/D41547 This fixes "Did not see access type in access path" fatal errors when building the devel/gdb port (version 8.1). Reported by: jbeich PR: 226658 MFC after: 3 months X-MFC-With: r327952