Core issue 287, PR c++/7639
* cp-tree.h (lang_type_class): Add decl_list field.
(CLASSTYPE_DECL_LIST): New macro.
(maybe_add_class_template_decl_list): Add declaration.
* class.c (duplicate_tag_error): Initialize CLASSTYPE_DECL_LIST.
(unreverse_member_declarations): Reverse CLASSTYPE_DECL_LIST.
(maybe_add_class_template_decl_list): New function.
(add_implicitly_declared_members): Use it.
* decl.c (maybe_process_template_type_declaration): Likewise.
(pushtag): Likewise.
* friend.c (add_friend): Likewise.
(make_friend_class): Likewise.
* semantics.c (finish_member_declaration): Likewise.
(begin_class_definition): Initialize CLASSTYPE_DECL_LIST.
* pt.c (instantiate_class_template): Use CLASSTYPE_DECL_LIST
to process members and friends in the order of declaration.