[cfe-dev] [PATCH] Extend the use of DeclGroup

[Zhongxing Xu]

This patch is the first step to solve the problem that no one is owning the
struct decl in the following code:

typedef struct s {} s_t;

Later a TypeSpecifier holding this struct decl will be added to DeclGroup as
discussed on the mailing list months before.

The root of changes is at Sema::FinalizeDeclaratorGroup.  It returns
DeclGroupOwningRef instead of DeclTy*.  A bunch of related methods now
return
DeclGroupOwningRef instead of DeclTy*.

Top level declarations are DeclGroups instead of Decls.  TranslationUnit
uses a vector of DeclGroupOwningRef to track all Decls.  Most of the dtor of
TranslationUnit is disabled. The cleanup works should be done by the
DeclGroup.

LinkageSpecDecl now uses a DeclGroup array to track all Decls.

Three ObjC static analysis test cases fail. I haven't figured out the
reasons.
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