re PR c++/43787 (memory copy of empty class (sizeof is one))

re PR c++/43787 (memory copy of empty class (sizeof is one))

	PR c++/43787
gcc:
	* gimplify.c (gimplify_expr): Keep working if gimplify_modify_expr
	returns GS_OK.
	(gimplify_modify_expr_rhs): Return GS_OK if anything changed.
gcc/cp:
	* cp-gimplify.c (cp_gimplify_expr): Remove copies of empty classes.
	* call.c (build_over_call): Don't try to avoid INIT_EXPR copies here.

From-SVN: r159072