dart2js: Add "onlyForRti" to Classes in model of the new emitter.

pkg/compiler/lib/src/js_emitter/model.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;
 
 import '../js/js.dart' as js show Expression;
 import '../constants/values.dart' show ConstantValue;
 
 class Program {
@@ skipping 117 matching lines @@
   StaticField(this.name, this.holder, this.code,
               this.isFinal, this.isLazy);
 }
 
 class Class {
   final String name;
   final Holder holder;
   Class superclass;
   final List<Method> methods;
   final List<InstanceField> fields;
+  final bool onlyForRti;
 
   /// Whether the class must be evaluated eagerly.
   bool isEager = false;
 
   Class(this.name, this.holder, this.methods, this.fields,
-        { this.isEager: false });
+        { this.onlyForRti }) {
+    assert(onlyForRti != null);
+  }
 
   void setSuperclass(Class superclass) {
     this.superclass = superclass;
   }
 
   String get superclassName
       => (superclass == null) ? "" : superclass.name;
   int get superclassHolderIndex
       => (superclass == null) ? 0 : superclass.holder.index;
 }
@@ skipping 24 matching lines @@
   final String name;
   final js.Expression code;
   Method(this.name, this.code);
 }
 
 class StaticMethod extends Method {
   final Holder holder;
   StaticMethod(String name, this.holder, js.Expression code)
       : super(name, code);
 }