Use weak cells in dependent code.

src/serialize.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/base/platform/platform.h"
 #include "src/bootstrapper.h"
@@ skipping 664 matching lines @@
   isolate->heap()->set_new_array_buffer_views_list(
       isolate_->heap()->undefined_value());
 
   // The allocation site list is build during root iteration, but if no sites
   // were encountered then it needs to be initialized to undefined.
   if (isolate_->heap()->allocation_sites_list() == Smi::FromInt(0)) {
     isolate_->heap()->set_allocation_sites_list(
         isolate_->heap()->undefined_value());
   }
 
-  isolate_->heap()->InitializeWeakObjectToCodeTable();
-
   // Update data pointers to the external strings containing natives sources.
   for (int i = 0; i < Natives::GetBuiltinsCount(); i++) {
     Object* source = isolate_->heap()->natives_source_cache()->get(i);
     if (!source->IsUndefined()) {
       ExternalOneByteString::cast(source)->update_data_cache();
     }
   }
 
   FlushICacheForNewCodeObjects();
 
@@ skipping 1966 matching lines @@
 SerializedCodeData* SerializedCodeData::FromCachedData(ScriptData* cached_data,
                                                        String* source) {
   DisallowHeapAllocation no_gc;
   SerializedCodeData* scd = new SerializedCodeData(cached_data);
   if (scd->IsSane(source)) return scd;
   cached_data->Reject();
   delete scd;
   return NULL;
 }
 } }  // namespace v8::internal