Implement '==', '!=' and instanceof (without code generation).

tests/language/src/BoolTest.dart

 // Copyright (c) 2011, 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.
 
 // Dart test program for testing basic boolean properties.
 // @static-clean
 
 class BoolTest {
   static void testEquality() {
     Expect.equals(true, true);
@@ skipping 87 matching lines @@
     if (false !== false) {
       throw "Expect.equals broken";
     }
   }
 
   static void testToString() {
     Expect.equals("true", true.toString());
     Expect.equals("false", false.toString());
   }
 
+  static void testNegate(isTrue, isFalse) {
+    Expect.equals(true, !false);
+    Expect.equals(false, !true);
+    Expect.equals(true, !isFalse);
+    Expect.equals(false, !isTrue);
+  }
+
   static void testMain() {
     testEquality();
+    testNegate(true, false);
     testToString();
   }
 }
 
 main() {
   BoolTest.testMain();
 }