DR 990

	DR 990
	* call.c (add_list_candidates): Prefer the default constructor.
	(build_aggr_conv): Treat missing initializers like { }.
	* typeck2.c (process_init_constructor_record): Likewise.
	* init.c (expand_default_init): Use digest_init for
	direct aggregate initialization, too.

	* call.c (add_list_candidates): Split out...
	(build_user_type_conversion_1): ...from here.
	(build_new_method_call): And here.
	(implicit_conversion): Propagate LOOKUP_NO_NARROWING.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@160132 138bc75d-0d04-0410-961f-82ee72b054a4