[serializer] allow test-serialize/PartialSerializerCustomContext to optimize.

test/cctest/test-serialize.cc

 // Copyright 2007-2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 499 matching lines @@
     SnapshotData partial_snapshot(partial_serializer);
 
     *partial_blob_out = WritePayload(partial_snapshot.RawData());
     *startup_blob_out = WritePayload(startup_snapshot.RawData());
   }
   v8_isolate->Dispose();
 }
 
 UNINITIALIZED_TEST(PartialSerializerCustomContext) {
   DisableTurbofan();
-  FLAG_crankshaft = false;
   Vector<const byte> startup_blob;
   Vector<const byte> partial_blob;
   PartiallySerializeCustomContext(&startup_blob, &partial_blob);
 
   v8::Isolate* v8_isolate = InitializeFromBlob(startup_blob);
   CHECK(v8_isolate);
   startup_blob.Dispose();
   {
     v8::Isolate::Scope isolate_scope(v8_isolate);
 
     Isolate* isolate = reinterpret_cast<Isolate*>(v8_isolate);
     HandleScope handle_scope(isolate);
     Handle<Object> root;
     Handle<JSGlobalProxy> global_proxy =
         isolate->factory()->NewUninitializedJSGlobalProxy();
     {
       SnapshotData snapshot_data(partial_blob);
       Deserializer deserializer(&snapshot_data);
       root = deserializer.DeserializePartial(isolate, global_proxy)
                  .ToHandleChecked();
       CHECK(root->IsContext());
       Handle<Context> context = Handle<Context>::cast(root);
+
+      // Add context to the weak native context list
+      context->set(Context::NEXT_CONTEXT_LINK,
+                   isolate->heap()->native_contexts_list(),
+                   UPDATE_WEAK_WRITE_BARRIER);
+      isolate->heap()->set_native_contexts_list(*context);
+
       CHECK(context->global_proxy() == *global_proxy);
       Handle<String> o = isolate->factory()->NewStringFromAsciiChecked("o");
       Handle<JSObject> global_object(context->global_object(), isolate);
       Handle<Object> property = JSReceiver::GetDataProperty(global_object, o);
       CHECK(property.is_identical_to(global_proxy));
 
       v8::Local<v8::Context> v8_context = v8::Utils::ToLocal(context);
       v8::Context::Scope context_scope(v8_context);
       double r = CompileRun("r")
                      ->ToNumber(v8_isolate->GetCurrentContext())
@@ skipping 1101 matching lines @@
   delete script_data;
 }
 
 
 TEST(SerializationMemoryStats) {
   FLAG_profile_deserialization = true;
   FLAG_always_opt = false;
   v8::StartupData blob = v8::V8::CreateSnapshotDataBlob();
   delete[] blob.data;
 }