* gcc.dg/compat/scalar-by-value-4_x.c: Also test passing of
	variable arguments.
	* gcc.dg/compat/scalar-by-value-4_y.c (testva##NAME): New.
	* gcc.dg/compat/scalar-by-value-4_main.c: Update description comment.
	* gcc.dg/compat/scalar-return-4_x.c: Also test returning of
	variable argument.
	* gcc.dg/compat/scalar-return-4_y.c (testva##NAME): New.
	* gcc.dg/compat/scalar-return-4_main.c: Update description comment.

From-SVN: r240099