Introduce the core infrastructure needed to model redeclaration chains
for Objective-C protocols, 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 that we know which declaration is the definition - Serialization support for redeclaration chains and for adding definitions to already-serialized declarations. However, note that we're not taking advantage of much of this code yet, because we're still re-using ObjCProtocolDecls. llvm-svn: 147410
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