Fix optimizations on static fields in precompiled code.

tests/language/vm/precompiled_static_initializer_test.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 test.null_test;
-
-import 'dart:mirrors';
+// Test optimizations with static fields with precompilation.
+// VMOptions=--noopt --inlining-hotness=0
 
 import 'package:expect/expect.dart';
 
+init() => 123;
+
+final a = init();
+
 main() {
-  InstanceMirror nullMirror = reflect(null);
-  for (int i = 0; i < 10; i++) {
-    Expect.isTrue(nullMirror.getField(#hashCode).reflectee is int);
+  var s = 0;
+  for (var i = 0; i < 10; i++) {
+    s += a;
   }
+  Expect.equals(10 * 123, s);
 }