* cp-tree.h (struct saved_scope): Change decl_ns_list field type
	to a VEC.
	* decl2.c (cp_write_global_declarations): Adjust for new type of
	decl_namespace_list.
	* name-lookup.c (current_decl_namespace): Likewise.
	(push_decl_namespace): Likewise.
	(pop_decl_namespace): Likewise.

From-SVN: r160487