Audit the code for places where it is assumed that every base specifier refers to a RecordType. Add assertions or conditions as appropriate. This fixes another crash in the Apache stdlib vector.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@85055 91177308-0d34-0410-b5e6-96231b3b80d8
7 files changed