Introduce the core infrastructure needed to model a complete
redeclaration chain for Objective-C classes, including: - Using the first declaration as the canonical declaration. - Using the definition as the primary DeclContext - Making sure that all declarations have a pointer to the definition data, and the definition knows that it is the definition. - Serialization support for when a definition gets added to a declaration that comes from an AST file. However, note that we're not taking advantage of much of this code yet, because we're still re-using ObjCInterfaceDecls. llvm-svn: 146667
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