Fix bug 8841 by running the closure analyzer before compiling a field.

tests/language/closure_in_field_initializer_test.dart

Index: tests/language/closure_in_field_initializer_test.dart
===================================================================
--- tests/language/closure_in_field_initializer_test.dart	(revision 0)
+++ tests/language/closure_in_field_initializer_test.dart	(revision 0)
@@ -0,0 +1,14 @@
+// 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.
+
+class Foo {
+  var closures = {
+    'a': (x, y) => x + y
+  };
+}
+
+main() {
+  var closures = new Foo().closures;
+  Expect.equals(6, closures['a'](4, 2));
+}