dart2js: Fix lazy statics in the startup-emitter.

tests/language/lazy_static7_test.dart

 // Copyright (c) 2015, 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.
 
 import "package:expect/expect.dart";
 
-class A {
-  call({a: 42}) {
-    return 499 + a;
-  }
-}
+var sideEffect = 0;
+var x = (() { sideEffect++; return 499; })();
 
 main() {
-  Expect.equals(497, Function.apply(new A(), [], {#a: -2}));
+  if (new DateTime.now().day >= -1) {
+    x = 42;
+  }
+  Expect.equals(42, x);
+  Expect.equals(0, sideEffect);
 }