Insert the right checks for redirecting factories to deferred constructors.

pkg/compiler/lib/src/resolution/members.dart

Index: pkg/compiler/lib/src/resolution/members.dart
diff --git a/pkg/compiler/lib/src/resolution/members.dart b/pkg/compiler/lib/src/resolution/members.dart
index 986663e59f250e2d153f5702df440e6cb6b23744..1959ec15ab70be0ea9fd2026973aaf65c7b47eab 100644
--- a/pkg/compiler/lib/src/resolution/members.dart
+++ b/pkg/compiler/lib/src/resolution/members.dart
@@ -3227,6 +3227,14 @@ class ResolverVisitor extends MappingVisitor<ResolutionResult> {
     ConstructorElement redirectionTarget = resolveRedirectingFactory(
         node, inConstContext: isConstConstructor);
     constructor.immediateRedirectionTarget = redirectionTarget;
+
+    Node constructorReference = node.constructorReference;
+    if (constructorReference is Send) {
+      constructor.redirectionDeferredPrefix =
+          compiler.deferredLoadTask.deferredPrefixElement(constructorReference,
+                                                          registry.mapping);
+    }
+
     registry.setRedirectingTargetConstructor(node, redirectionTarget);
     if (Elements.isUnresolved(redirectionTarget)) {
       registry.registerThrowNoSuchMethod();