h8300.md (<code>qi3_1): Add gcc_unreachable to keep warnings quiet.

	* config/h8300/h8300.md (<code>qi3_1): Add gcc_unreachable to keep
	warnings quiet.

From-SVN: r266762

gcc/ChangeLog

 2018-12-03  Jeff Law  <law@redhat.com>
 
+	* config/h8300/h8300.md (<code>qi3_1): Add gcc_unreachable to keep
+	warnings quiet.
+
 	* config/h8300/h8300.md (low byte masking peepholes): Only accept
 	nonimmediate_operand for the to-be-masked operand.
 

gcc/config/h8300/h8300.md

@@ -1629,6 +1629,7 @@
       return <CODE> == IOR ? "bset\\t%V2,%R0" : "bnot\\t%V2,%R0"; 
     else if (which_alternative == 1)
       return <CODE> == IOR ? "or\\t%X2,%X0" : "xor\\t%X2,%X0";
+    gcc_unreachable ();
   }
   [(set_attr "length" "8,*")
    (set_attr "length_table" "*,logicb")