cr16.c (cr16_print_operand): Add missing fallthru comment.

	* config/cr16/cr16.c (cr16_print_operand): Add missing fallthru
	comment.  Add gcc_unreachable for path that should never happen.

From-SVN: r241584

gcc/ChangeLog

 2016-10-26  Jeff Law  <law@redhat.com>
 
+	* config/cr16/cr16.c (cr16_print_operand): Add missing fallthru
+	comment.  Add gcc_unreachable for path that should never happen.
+
 	* config/epiphany/epiphany.c (epiphany_print_operand): Adjust
 	fallthru comment.
 

gcc/config/cr16/cr16.c

@@ -1476,6 +1476,7 @@ cr16_print_operand (FILE * file, rtx x, int code)
     case 'g':
       /* 'g' is used for implicit mem: dereference.  */
       ptr_dereference = 1;
+      /* FALLTHRU */
     case 'f':
     case 0:
       /* default.  */
@@ -1528,6 +1529,7 @@ cr16_print_operand (FILE * file, rtx x, int code)
 	  cr16_print_operand_address (file, VOIDmode, x);
 	  return;
 	}
+      gcc_unreachable ();
     default:
       output_operand_lossage ("invalid %%xn code");
     }