dart2js: Use is-checks from the model in the old emitter.

pkg/compiler/lib/src/js_emitter/new_emitter/model_emitter.dart

 // Copyright (c) 2014, 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.
 
 library dart2js.new_js_emitter.model_emitter;
 
 import '../../dart2jslib.dart' show Compiler;
 import '../../js/js.dart' as js;
 import '../../js_backend/js_backend.dart' show
     JavaScriptBackend,
@@ skipping 353 matching lines @@
                      js.number(cls.superclassHolderIndex)];
 
     if (cls.isMixinApplication) {
       MixinApplication mixin = cls;
       elements.add(js.string(mixin.mixinClass.name));
       elements.add(js.number(mixin.mixinClass.holder.index));
     } else {
       elements.add(_generateConstructor(cls));
     }
     Iterable<Method> methods = cls.methods;
+    Iterable<Method> isChecks = cls.isChecks;
     Iterable<Method> gettersSetters = _generateGettersSetters(cls);
-    Iterable<Method> allMethods = [methods, gettersSetters].expand((x) => x);
+    Iterable<Method> allMethods =
+        [methods, isChecks, gettersSetters].expand((x) => x);
     elements.addAll(allMethods.expand((e) => [js.string(e.name), e.code]));
     return unparse(compiler, new js.ArrayInitializer(elements));
   }
 
   js.Expression emitLazyInitializer(StaticField field) {
     assert(field.isLazy);
     return unparse(compiler, field.code);
   }
 
   js.Expression emitStaticMethod(StaticMethod method) {
@@ skipping 186 matching lines @@
 
   var end = Date.now();
   print('Setup: ' + (end - start) + ' ms.');
 
   #main();  // Start main.
 
 }(Date.now(), #code)
 }""";
 
 }