* gcc.dg/compat/union-by-value-1_main.c,
	union-by-value-1_x.c, union-by-value-1_y.c,
	union-check.h, union-defs.h,
	union-init.h, union-return-1_main.c,
	union-return-1_x.c, union-return-1_y.c: New files.

From-SVN: r79539