SDK fixes

test/generated_sdk/lib/_internal/compiler/js_lib/js_helper.dart

 // Copyright (c) 2013, 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 _js_helper;
 
 import 'dart:_js_embedded_names' show
     ALL_CLASSES,
     GET_ISOLATE_TAG,
     INTERCEPTED_NAMES,
@@ skipping 667 matching lines @@
       }
       return handleError(source);
     }
     return result;
   }
 
   /** [: r"$".codeUnitAt(0) :] */
   static const int DOLLAR_CHAR_VALUE = 36;
 
   // TODO(jmesserly): remove this method.
-  static constructorNameFallback = JS('Function', r'''
+  static var constructorNameFallback = JS('Function', r'''
   function getTagFallback(o) {
     var constructor = o.constructor;
     if (typeof constructor == "function") {
       var name = constructor.name;
       // If the name is a non-empty string, we use that as the type name of this
       // object.  There are various cases where that does not work, so we have to
       // detect them and fall through to the toString() based implementation.
 
       if (typeof name == "string" &&
 
@@ skipping 2771 matching lines @@
   throw new MainError("No top-level function named 'main'.");
 }
 
 void badMain() {
   throw new MainError("'main' is not a function.");
 }
 
 void mainHasTooManyParameters() {
   throw new MainError("'main' expects too many parameters.");
 }