Move relational operators to the new interceptors.

tests/compiler/dart2js/value_range_test.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import 'compiler_helper.dart';
 
 const int REMOVED = 0;
 const int ABOVE_ZERO = 1;
 const int BELOW_LENGTH = 2;
 const int KEPT = 3;
@@ skipping 223 matching lines @@
     operator +(other) {}
     operator -(other) {}
     operator ~/(other) {}
     operator /(other) {}
     operator *(other) {}
     operator <<(other) {}
     operator >>(other) {}
     operator |(other) {}
     operator &(other) {}
     operator ^(other) {}
+    operator <(other) {}
+    operator >(other) {}
+    operator <=(other) {}
+    operator >=(other) {}
+    operator ==(other) {}
   }
-  class JSInt {
+  class JSInt extends JSNumber {
   }
-  class JSDouble {
+  class JSDouble extends JSNumber {
   }
   class JSNull {
   }
   class JSBool {
   }
   class JSFunction {
   }
   class ObjectInterceptor {
   }
   getInterceptor(x) {}''';
@@ skipping 36 matching lines @@
       break;
   }
 }
 
 
 main() {
   for (int i = 0; i < TESTS.length;  i += 2) {
     expect(TESTS[i], TESTS[i + 1]);
   }
 }