dart2js: Fast fix for deferred globals.

tests/language/deferred_global_lib.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.
+
+var sideEffectCounter = 0;
+
+final finalConstGlobal = "finalConstGlobal";
+final finalNonConstGlobal = (() {
+  sideEffectCounter++;
+  return "finalNonConstGlobal";
+}());
+
+var lazyConstGlobal = "lazyConstGlobal";
+var lazyNonConstGlobal = (() {
+  sideEffectCounter++;
+  return "lazyNonConstGlobal";
+}());
+
+readFinalConstGlobal() => finalConstGlobal;
+readFinalNonConstGlobal() => finalNonConstGlobal;
+readLazyConstGlobal() => lazyConstGlobal;
+readLazyNonConstGlobal() => lazyNonConstGlobal;
+writeLazyConstGlobal(x) { lazyConstGlobal = x; }
+writeLazyNonConstGlobal(x) { lazyNonConstGlobal = x; }