Fix initialization of instance fields.

pkg/kernel/testcases/interpreter/object_field_initializers_test.dart

 // Copyright (c) 2017, 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 object_field_initializers_test;
 
 /// Simple program creating an object with instance field initializers in the
 /// declaration of the class.
 ///
 /// The static function `fieldInitializer` is used to ensure the fields are
@@ skipping 42 matching lines @@
   String foo4 = fieldInitializer(5, 'foo4');
 
   B(String foo1, String foo2) {
     this.foo1 = foo1;
     this.foo2 = foo2;
     this.foo4 = fieldInitializer(6, 'bar4');
   }
 }
 
 class C {
+  static String staticFoo = 'foo';

[Dmitry Stefantsov, 2017/08/21 09:40:33]

Looks like this update didn't change anything in the corresponding .expect file.
 An update in the debug output that makes the change visible would be nice :)

   String foo1 = fieldInitializer(1, 'foo1');
   String foo2;
   String foo3 = fieldInitializer(2, 'foo3');
 
   C(this.foo1, this.foo2) {
     foo3 = fieldInitializer(3, 'foo3');
   }
 }
 
 String fieldInitializer(int f, String s) {
   print('$s: $f');
   return '$s: $f';
 }