re PR c++/9649 (ICE in finish_member_declaration at cp/semantics.c:1850 when redeclaring a static member variable)

	PR c++/9649
	* cp-tree.h (pushdecl_class_level): Change prototype.
	(push_class_level_binding): Likewise.
	* decl.c (add_binding): Reject duplicate static data members.
	(pushdecl_class_level): Return a value indicating whether or not
	the binding was valid.
	(push_class_level_binding): Likewise.
	* semantics.c (finish_member_declaration): Don't keep invalid
	declarations.

	PR c++/9649
	* g++.dg/template/static4.C: New test.
	* g++.old-deja/g++.other/anon7.C: Remove spurious error messages.

From-SVN: r68240