revert thread isolate in PreallocatedStorageAllocationPolicy

src/string-stream.cc

 // Copyright 2012 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 186 matching lines @@
     DebugObjectCache* debug_object_cache = Isolate::Current()->
         string_stream_debug_object_cache();
     for (int i = 0; i < debug_object_cache->length(); i++) {
       if ((*debug_object_cache)[i] == o) {
         Add("#%d#", i);
         return;
       }
     }
     if (debug_object_cache->length() < kMentionedObjectCacheMaxSize) {
       Add("#%d#", debug_object_cache->length());
-      HeapObject* ho = HeapObject::cast(o);
-      PreallocatedStorageAllocationPolicy policy(ho->GetIsolate());
-      debug_object_cache->Add(ho, policy);
+      debug_object_cache->Add(HeapObject::cast(o));
     } else {
       Add("@%p", o);
     }
   }
 }
 
 
 void StringStream::Add(const char* format) {
   Add(CStrVector(format));
 }
@@ skipping 74 matching lines @@
 Handle<String> StringStream::ToString() {
   Factory* factory = Isolate::Current()->factory();
   return factory->NewStringFromUtf8(Vector<const char>(buffer_, length_));
 }
 
 
 void StringStream::ClearMentionedObjectCache() {
   Isolate* isolate = Isolate::Current();
   isolate->set_string_stream_current_security_token(NULL);
   if (isolate->string_stream_debug_object_cache() == NULL) {
-    PreallocatedStorageAllocationPolicy policy(isolate);
     isolate->set_string_stream_debug_object_cache(
-        new(policy) DebugObjectCache(policy));
+        new List<HeapObject*, PreallocatedStorageAllocationPolicy>(0));
   }
   isolate->string_stream_debug_object_cache()->Clear();
 }
 
 
 #ifdef DEBUG
 bool StringStream::IsMentionedObjectCacheClear() {
   return (
       Isolate::Current()->string_stream_debug_object_cache()->length() == 0);
 }
@@ skipping 279 matching lines @@
 
 // Only grow once to the maximum allowable size.
 char* NoAllocationStringAllocator::grow(unsigned* bytes) {
   ASSERT(size_ >= *bytes);
   *bytes = size_;
   return space_;
 }
 
 
 } }  // namespace v8::internal