Finished semantic analysis of anonymous unions in C++.

Duplicate-member checking within classes is still a little messy, and
anonymous unions are still completely broken in C. We'll need to unify
the handling of fields in C and C++ to make this code applicable in
both languages.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@61878 91177308-0d34-0410-b5e6-96231b3b80d8
10 files changed