dart2js: add compiler builtins to the core-runtime.

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 '../../constants/values.dart' show ConstantValue, FunctionConstantValue;
 import '../../dart2jslib.dart' show Compiler;
 import '../../dart_types.dart' show DartType;
 import '../../elements/elements.dart' show ClassElement, FunctionElement;
@@ skipping 32 matching lines @@
   final NativeEmitter nativeEmitter;
 
   JavaScriptBackend get backend => compiler.backend;
 
   /// For deferred loading we communicate the initializers via this global var.
   static const String deferredInitializersGlobal =
       r"$__dart_deferred_initializers__";
 
   static const String deferredExtension = "part.js";
 
+  static const String typeNameProperty = r"builtin$cls";
+
   ModelEmitter(Compiler compiler, Namer namer, this.nativeEmitter)
       : this.compiler = compiler,
         this.namer = namer {
     // TODO(floitsch): remove hard-coded name.
     // TODO(floitsch): there is no harm in caching the template.
     js.Template makeConstantListTemplate =
         js.js.uncachedExpressionTemplate('makeConstList(#)');
 
     this.constantEmitter = new ConstantEmitter(
         compiler, namer, this.generateConstantReference,
@@ skipping 1020 matching lines @@
     } else {
       constructor = descriptor[2];
       functionsIndex = 3;
     }
 
     for (var i = functionsIndex; i < descriptor.length; i += 2) {
       parseFunctionDescriptor(prototype, descriptor[i], descriptor[i + 1],
                               typesOffset);
     }
 
-    constructor.builtin\$cls = name;  // Needed for RTI.
+    constructor.$typeNameProperty = name;  // Needed for RTI.
     constructor.prototype = prototype;
     prototype[#operatorIsPrefix + name] = constructor;
     prototype.constructor = constructor;
     return constructor;
   }
 
   function fillPrototypeWithMixedIn(mixinName, mixinHolderIndex, prototype) {
     var mixin = holders[mixinHolderIndex][mixinName].ensureResolved();
     var mixinPrototype = mixin.prototype;
 
@@ skipping 70 matching lines @@
 
   var end = Date.now();
   // print('Setup: ' + (end - start) + ' ms.');
 
   #invokeMain;  // Start main.
 
 }(Date.now(), #code)
 }""";
 
 }