X64: Made hash computation in serializer accept 64-bit pointers.

src/serialize.h

 // Copyright 2006-2008 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 52 matching lines @@
  public:
   ExternalReferenceEncoder();
 
   uint32_t Encode(Address key) const;
 
   const char* NameOfAddress(Address key) const;
 
  private:
   HashMap encodings_;
   static uint32_t Hash(Address key) {
-    return reinterpret_cast<uint32_t>(key) >> 2;
+    return static_cast<uint32_t>(reinterpret_cast<uintptr_t>(key) >> 2);
   }
 
   int IndexOf(Address key) const;
 
   static bool Match(void* key1, void* key2) { return key1 == key2; }
 
   void Put(Address key, int index);
 };
 
 
@@ skipping 242 matching lines @@
 #ifdef DEBUG
   bool expect_debug_information_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(Deserializer);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_SERIALIZE_H_