re PR middle-end/45307 (Stores expanding to no RTL not removed by tree optimizers, Empty ctors/dtors not eliminated)

	PR c++/45307
	* gimplify.c (gimplify_init_constructor): Just return GS_UNHANDLED
	if ctor is empty.
	(gimplify_modify_expr_rhs): Adjust.

From-SVN: r163380