* cp-tree.def (DEFAULT_ARG): Adjust documentation.
	* cp-tree.h (DEFARG_INSTANTIATIONS): New.
	(struct tree_default_arg): Add instantiations member.
	* parser.c (cp_parser_late_parsing_default_args): Adjust to use a
	VEC.
	* pt.c (tsubst_arg_types): Likewise.

From-SVN: r100707