wo_prof_single_str_global.c: Mask return value.

	* gcc.dg/struct/wo_prof_single_str_global.c: Mask return value.
	* gcc.dg/struct/wo_prof_single_str_local.c: Mask return value.
	* gcc.dg/struct/wo_prof_single_str_pointer.c: Mask return value.

From-SVN: r143309