With the new modules debugging, we have seen cases where clang is not emitting...

With the new modules debugging, we have seen cases where clang is not emitting full definitions for types that are member variables of classes. If we try to make a class with a member where the type of the class in a forward declaration, clang will assert and crash and bring down the IDE. This is not acceptable so we need to work around it. We work around it by making sure that if we have a member that is an instance (not a pointer or reference) of a class/struct/union, that it is a complete type. If it isn't then we emit an error to let the user know to file a bug against the compiler, and then we make the class complete, but empty. We also do this for base classes elsewhere. We use the DWARF to help layout the type, so we will get all instance variables correct, but we just won't have visibility into this instance variable.

llvm-svn: 252001