Obligatory fix for Win64.

src/profile-generator-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 90 matching lines @@
 
 
 HeapObject* V8HeapExplorer::GetNthGcSubrootObject(int delta) {
   return reinterpret_cast<HeapObject*>(
       reinterpret_cast<char*>(kFirstGcSubrootObject) +
       delta * HeapObjectsMap::kObjectIdStep);
 }
 
 
 int V8HeapExplorer::GetGcSubrootOrder(HeapObject* subroot) {
-  return (reinterpret_cast<char*>(subroot) -
-          reinterpret_cast<char*>(kFirstGcSubrootObject)) /
-      HeapObjectsMap::kObjectIdStep;
+  return static_cast<int>(
+      (reinterpret_cast<char*>(subroot) -
+       reinterpret_cast<char*>(kFirstGcSubrootObject)) /
+      HeapObjectsMap::kObjectIdStep);
 }
 
 
 uint64_t HeapEntry::id() {
   union {
     Id stored_id;
     uint64_t returned_id;
   } id_adaptor = {id_};
   return id_adaptor.returned_id;
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_PROFILE_GENERATOR_INL_H_