Serializer: do not miss outdated contexts if they are serialized deferred.

src/snapshot/serialize.cc

Index: src/snapshot/serialize.cc
diff --git a/src/snapshot/serialize.cc b/src/snapshot/serialize.cc
index fe33c3e8b2d71e86aa6322ab5ff69700baa7b298..66c47195ed2779d727da0350ac584b6ab464455a 100644
--- a/src/snapshot/serialize.cc
+++ b/src/snapshot/serialize.cc
@@ -617,8 +617,8 @@ MaybeHandle<Object> Deserializer::DeserializePartial(
   Object* root;
   Object* outdated_contexts;
   VisitPointer(&root);
-  VisitPointer(&outdated_contexts);
   DeserializeDeferredObjects();
+  VisitPointer(&outdated_contexts);
 
   // There's no code deserialized here. If this assert fires then that's
   // changed and logging should be added to notify the profiler et al of the
@@ -1395,8 +1395,8 @@ void PartialSerializer::Serialize(Object** o) {
     back_reference_map()->AddGlobalProxy(context->global_proxy());
   }
   VisitPointer(o);
-  SerializeOutdatedContextsAsFixedArray();
   SerializeDeferredObjects();
+  SerializeOutdatedContextsAsFixedArray();
   Pad();
 }