Enforce use of the forEachInstanceField ordering for constructed constants.

tests/language/const_constructor_super2_test.dart

 // Copyright (c) 2016, 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';
 
-var result;
+class A {
+  final a;
 
-class A {
-  noSuchMethod(im) {
-    result = 42;
-  }
+  const A(this.a);
 }
 
 class B extends A {
-  noSuchMethod(im) {
-    result = 87;
-  }
+  final b;
 
-  set foo(v) => super.foo = v; /// 01: static type warning
+  const B(a, this.b) : super(a);
 }
 
-main() {
-  new B().foo = 0;           /// 01: continued
-  Expect.equals(42, result); /// 01: continued
+@NoInline()
+foo() => const B(1, 2);
+
+@NoInline()
+bar() => const B(2, 2);
+
+void main() {
+  Expect.notEquals(foo(), bar());
+  Expect.notEquals(foo().a, bar().a);
+  Expect.equals(foo().b, bar().b);
 }