[cfe-commits] patch: make UsingDirective derive from Decl, not NamedDecl

[Nick Lewycky]

This patch changes UsingDirectives to be derived from Decl instead of 
NamedDecl, and consequently removes the CXXUsingDirective DeclarationName.

The way using directives are stored with this patch is to have a single 
pointer on each UsingDirectiveDecl that points to the previous 
declaration, and a pointer on TranslationUnit and Namespace DeclContexts 
that point to the last one in that chain. We don't need such pointers on 
other DeclContexts because they either can't hold using-directives or 
the lookup will be handled by Scope.

Please review!

Nick
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