* tree.c (build_vec_init_expr): Split out from...
	(build_array_copy): ...here.
	* init.c (perform_member_init): Use it.
	* cp-tree.h: Declare it.
	* cp-gimplify.c (cp_gimplify_init_expr): Don't gimplify the slot for
	VEC_INIT_EXPR and AGGR_INIT_EXPR here.  Drop pre/post parameters.
	(cp_gimplify_expr): Handle array default-initialization via
	VEC_INIT_EXPR.

From-SVN: r165976