Fix initialization of instance fields.

pkg/kernel/testcases/interpreter/instance_and_static_fields_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 and
+/// static fields in the declaration of the class.
+void main() {
+  print('Create instance of A');
+  var a1 = new A();
+  print(a1.foo1);
+  print(a1.foo2);
+  print(a1.foo3);
+
+  print('Read staticFoo');
+  print(A.staticFoo);
+}
+
+class A {
+  static String staticFoo = 'staticFoo';
+  String foo1 = 'foo1';
+  String foo2;
+  String foo3 = 'foo3';
+
+  A() {
+    this.foo2 = 'foo2';
+  }
+}