dart2js: add compiler builtins to the core-runtime.

sdk/lib/_internal/compiler/js_lib/native_helper.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.
 
 part of _js_helper;
 
 
 // TODO(ngeoffray): stop using this method once our optimizers can
 // change str1.contains(str2) into str1.indexOf(str2) != -1.
 bool contains(String userAgent, String name) {
@@ skipping 73 matching lines @@
           '{value: #, enumerable: false, writable: true, configurable: true})',
       obj,
       property,
       value);
 }
 
 
 // Is [obj] an instance of a Dart-defined class?
 bool isDartObject(obj) {
   // Some of the extra parens here are necessary.
-  return JS('bool', '((#) instanceof (#))', obj, JS_DART_OBJECT_CONSTRUCTOR());
+  return JS('bool', '((#) instanceof (#))',
+      obj,
+      JS_BUILTIN('depends:none;effects:none;',
+                 JsBuiltin.dartObjectConstructor));
 }
 
 /**
  * A JavaScript object mapping tags to the constructors of interceptors.
  * This is a JavaScript object with no prototype.
  *
  * Example: 'HTMLImageElement' maps to the ImageElement class constructor.
  */
 get interceptorsByTag => JS_EMBEDDED_GLOBAL('=Object', INTERCEPTORS_BY_TAG);
 
@@ skipping 538 matching lines @@
 const _safariHooksTransformer = const JS_CONST(r'''
 function(hooks) { return hooks; }
 ''');
 
 
 const _dartExperimentalFixupGetTagHooksTransformer = const JS_CONST(r'''
 function(hooks) {
   if (typeof dartExperimentalFixupGetTag != "function") return hooks;
   hooks.getTag = dartExperimentalFixupGetTag(hooks.getTag);
 }''');