revert: re PR c++/40975 (ICE in copy_tree_r on array new)

revert: re PR c++/40975 (ICE in copy_tree_r on array new)

	Revert:
	PR c++/40975
	* cp-tree.def (VEC_INIT_EXPR): Add third operand.
	* cp-tree.h (VEC_INIT_EXPR_NELTS): New.
	* cp-gimplify.c (cp_gimplify_expr) [VEC_INIT_EXPR]: Handle it.
	* tree.c (build_vec_init_expr): Handle getting pointer/nelts.
	(build_vec_init_elt): Don't expect an array type.
	(build_array_copy): Adjust.
	* init.c (perform_member_init): Adjust.
	(build_new_1): Use build_vec_init_expr.

From-SVN: r173274