S/390: Add missing fallthrough comments.

gcc/ChangeLog:

2016-09-26  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>

	* config/s390/s390.c (s390_rtx_costs): Add /* fallthrough */.
	(s390_sched_score): Likewise.

From-SVN: r240495

gcc/ChangeLog

+2016-09-26  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>
+
+	* config/s390/s390.c (s390_rtx_costs): Add /* fallthrough */.
+	(s390_sched_score): Likewise.
+
 2016-09-26  Martin Liska  <mliska@suse.cz>
 
 	* doc/gcov.texi: Update program output of gcov tool.

gcc/config/s390/s390.c

@@ -3467,6 +3467,7 @@ s390_rtx_costs (rtx x, machine_mode mode, int outer_code,
 	  *total = COSTS_N_INSNS (2);
 	  return true;
 	}
+      /* fallthrough */
     case ASHIFT:
     case ASHIFTRT:
     case LSHIFTRT:
@@ -13855,6 +13856,7 @@ s390_sched_score (rtx_insn *insn)
 	score += 5;
       if ((mask & S390_SCHED_ATTR_MASK_GROUPALONE) != 0)
 	score += 10;
+      /* fallthrough */
     case 1:
       /* Prefer not cracked insns while trying to put together a
 	 group.  */