Fix compilation error on X64. Error is from r5080

src/profile-generator.cc

 // 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 1539 matching lines @@
   HashMap::Entry* entry = entries_map_.Lookup(addr, AddressHash(addr), true);
   ASSERT(entry->value == NULL);
   entry->value = reinterpret_cast<void*>(entries_->length());
   entries_->Add(EntryInfo(id));
 }
 
 
 uint64_t HeapObjectsMap::FindEntry(Address addr) {
   HashMap::Entry* entry = entries_map_.Lookup(addr, AddressHash(addr), false);
   if (entry != NULL) {
-    int entry_index = reinterpret_cast<intptr_t>(entry->value);
+    int entry_index =
+        static_cast<int>(reinterpret_cast<intptr_t>(entry->value));
     EntryInfo& entry_info = entries_->at(entry_index);
     entry_info.accessed = true;
     return entry_info.id;
   } else {
     return 0;
   }
 }
 
 
 void HeapObjectsMap::RemoveDeadEntries() {
   List<EntryInfo>* new_entries = new List<EntryInfo>();
   for (HashMap::Entry* entry = entries_map_.Start();
        entry != NULL;
        entry = entries_map_.Next(entry)) {
-    int entry_index = reinterpret_cast<intptr_t>(entry->value);
+    int entry_index =
+        static_cast<int>(reinterpret_cast<intptr_t>(entry->value));
     EntryInfo& entry_info = entries_->at(entry_index);
     if (entry_info.accessed) {
       entry->value = reinterpret_cast<void*>(new_entries->length());
       new_entries->Add(EntryInfo(entry_info.id, false));
     }
   }
   delete entries_;
   entries_ = new_entries;
 }
 
@@ skipping 232 matching lines @@
     HeapEntry* entry = added_entries[i];
     if (entry->painted_reachable())
       diff->AddAddedEntry(entry);
   }
   return diff;
 }
 
 } }  // namespace v8::internal
 
 #endif  // ENABLE_LOGGING_AND_PROFILING