PR c++/9847
	* cp-tree.h (duplicate_tag_error): Remove.
	* class.c (duplicate_tag_error): Remove.
	* semantics.c (begin_class_definition): Return immediately for a
	duplicate class definition.

	PR c++/10451
	* decl.c (grokdeclarator): Correct logic for "mutable" errors.

From-SVN: r65998