Insert the right checks for redirecting factories to deferred constructors.

pkg/compiler/lib/src/elements/elements.dart

 // Copyright (c) 2012, 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 elements;
 
 
 import '../constants/expressions.dart';
 import '../tree/tree.dart';
 import '../util/util.dart';
@@ skipping 1214 matching lines @@
   ///
   ///     class C { factory C() = D; }
   ///     class D { factory D() = E; }
   ///     class E { E(); }
   ///
   /// The immediate redirection target of `C` is `D` and the immediate
   /// redirection target of `D` is `E`. `E` is not a redirecting factory
   /// constructor so its immediate redirection target is `null`.
   ConstructorElement get immediateRedirectionTarget;
 
+  bool get isCyclicRedirection;
+
+  /// The prefix of the immediateRedirectionTarget, if it is deferred.
+  /// [null] if it is not deferred.
+  PrefixElement get redirectionDeferredPrefix;
+
   /// Is `true` if this constructor is a redirecting generative constructor.
   bool get isRedirectingGenerative;
 
   /// Is `true` if this constructor is a redirecting factory constructor.
   bool get isRedirectingFactory;
 
   /// Compute the type of the effective target of this constructor for an
   /// instantiation site with type [:newType:].
   InterfaceType computeEffectiveTargetType(InterfaceType newType);
 
@@ skipping 387 matching lines @@
   bool get isDeclaredByField;
 
   /// Returns `true` if this member is abstract.
   bool get isAbstract;
 
   /// If abstract, [implementation] points to the overridden concrete member,
   /// if any. Otherwise [implementation] points to the member itself.
   Member get implementation;
 }