[ARC] Reject constant-constant comparison.

gcc/
2016-01-27  Claudiu Zissulescu  <claziss@synopsys.com>

        * config/arc/predicates.md (proper_comparison_operator): Reject
        constant-constant comparison.

From-SVN: r232868

gcc/ChangeLog

+2016-01-27  Claudiu Zissulescu  <claziss@synopsys.com>
+
+        * config/arc/predicates.md (proper_comparison_operator): Reject
+        constant-constant comparison.
+
 2016-01-26  Tom de Vries  <tom@codesourcery.com>
 
 	PR tree-optimization/69110

gcc/config/arc/predicates.md

@@ -510,6 +510,8 @@
     /* From combiner.  */
     case QImode: case HImode: case DImode: case SFmode: case DFmode:
       return 0;
+    case VOIDmode:
+      return 0;
     default:
       gcc_unreachable ();
   }