Codeview references to unnamed structs and unions are expected to refer to the
complete type definition instead of a forward reference so Visual Studio can
resolve the type properly.
Differential Revision: https://reviews.llvm.org/D32498
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@334382 91177308-0d34-0410-b5e6-96231b3b80d8