revert thread isolate in PreallocatedStorageAllocationPolicy

src/allocation-inl.h

 // Copyright 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 17 matching lines @@
 #ifndef V8_ALLOCATION_INL_H_
 #define V8_ALLOCATION_INL_H_
 
 #include "allocation.h"
 
 namespace v8 {
 namespace internal {
 
 
 void* PreallocatedStorageAllocationPolicy::New(size_t size) {
-  return isolate_->PreallocatedStorageNew(size);
+  return Isolate::Current()->PreallocatedStorageNew(size);
 }
 
 
 void PreallocatedStorageAllocationPolicy::Delete(void* p) {
-  return isolate_->PreallocatedStorageDelete(p);
+  return Isolate::Current()->PreallocatedStorageDelete(p);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ALLOCATION_INL_H_