Make assertion scopes thread safe.

src/serialize.h

 // 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 390 matching lines @@
   void PutInt(uintptr_t integer, const char* description);
   virtual int Position() = 0;
 };
 
 
 // Mapping objects to their location after deserialization.
 // This is used during building, but not at runtime by V8.
 class SerializationAddressMapper {
  public:
   SerializationAddressMapper()
-      : serialization_map_(new HashMap(&SerializationMatchFun)),
-        no_allocation_(new AssertNoAllocation()) { }
+      : no_allocation_(),
+        serialization_map_(new HashMap(&SerializationMatchFun)) { }
 
   ~SerializationAddressMapper() {
     delete serialization_map_;
-    delete no_allocation_;
   }
 
   bool IsMapped(HeapObject* obj) {
     return serialization_map_->Lookup(Key(obj), Hash(obj), false) != NULL;
   }
 
   int MappedTo(HeapObject* obj) {
     ASSERT(IsMapped(obj));
     return static_cast<int>(reinterpret_cast<intptr_t>(
         serialization_map_->Lookup(Key(obj), Hash(obj), false)->value));
@@ skipping 16 matching lines @@
   }
 
   static void* Key(HeapObject* obj) {
     return reinterpret_cast<void*>(obj->address());
   }
 
   static void* Value(int v) {
     return reinterpret_cast<void*>(v);
   }
 
+  DisallowHeapAllocation no_allocation_;
   HashMap* serialization_map_;
-  AssertNoAllocation* no_allocation_;
   DISALLOW_COPY_AND_ASSIGN(SerializationAddressMapper);
 };
 
 
 // There can be only one serializer per V8 process.
 class Serializer : public SerializerDeserializer {
  public:
   explicit Serializer(SnapshotByteSink* sink);
   ~Serializer();
   void VisitPointers(Object** start, Object** end);
@@ skipping 189 matching lines @@
  private:
   virtual bool ShouldBeInThePartialSnapshotCache(HeapObject* o) {
     return false;
   }
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_SERIALIZE_H_