Insert the right checks for redirecting factories to deferred constructors.

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

Index: pkg/compiler/lib/src/elements/elements.dart
diff --git a/pkg/compiler/lib/src/elements/elements.dart b/pkg/compiler/lib/src/elements/elements.dart
index dc8650408d5eda22cf29027819a3b56d05381456..3d646a51cf1e23c3a4f3157e00132c491891994e 100644
--- a/pkg/compiler/lib/src/elements/elements.dart
+++ b/pkg/compiler/lib/src/elements/elements.dart
@@ -1232,6 +1232,12 @@ abstract class ConstructorElement extends FunctionElement
   /// 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;