[cfe-commits] [patch] Friend semantics

[John McCall]

This patch implements many, but not all, of the semantics required for 
friend declarations.  There's a lot left to be done, but it at least 
gets friend operators passing Sema.

I'd appreciate a review, since I'm interacting with lookup / etc. in 
ways that I haven't touched before.

Notable points:

- 'friend' is now outlawed by the parser in any context except 
class/struct/union definitions.
- Action::ActOnTag has a new tag kind, TK_Friend, triggered on 
standalone friend class declarations;  the rules turn out to be slightly 
different for these.
- Action::ActOnFriendDecl is the primary Action callback for friend 
declarations, called instead of ActOnDeclarator or 
ParsedFreeStandingDeclSpec.

John.
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