[cfe-dev] Ownership of Stmts and Exprs, and destroying them

[Sebastian Redl]

OK, revised version of the patch. AstGuard is now ASTGuard<Destroyer>, 
with typedef ExprGuard and StmtGuard.

AstArrayGuard now holds and owns (in fact, derives from) the SmallVector 
and was renamed to ASTVector, with template aliases (derived classes) 
ExprVector<unsigned N> and StmtVector<unsigned N>.
This has greatly simplified its use, as long as people remember that you 
have to explicitly give up ownership with take() instead of using &ar[0] 
to pass the content to the Sema.

Sebastian
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