Insert the right checks for redirecting factories to deferred constructors.

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

Index: pkg/compiler/lib/src/elements/modelx.dart
diff --git a/pkg/compiler/lib/src/elements/modelx.dart b/pkg/compiler/lib/src/elements/modelx.dart
index 7d96a64f2d686a5c2f4375fe224b8cbb3702ae9a..06368b571de57317179c1e413480a4ff2dd3a19f 100644
--- a/pkg/compiler/lib/src/elements/modelx.dart
+++ b/pkg/compiler/lib/src/elements/modelx.dart
@@ -1960,9 +1960,14 @@ abstract class ConstructorElementX extends FunctionElementX
         : super(name, kind, modifiers, enclosing, false);
 
   FunctionElement immediateRedirectionTarget;
+  PrefixElement redirectionDeferredPrefix;
 
   bool get isRedirectingFactory => immediateRedirectionTarget != null;
 
+  // TODO(johnniwinther): This should also return true for cyclic redirecting
+  // generative constructors.
+  bool get isCyclicRedirection => effectiveTarget.isRedirectingFactory;
+
   /// This field is set by the post process queue when checking for cycles.
   ConstructorElement internalEffectiveTarget;
   DartType effectiveTargetType;