Add integer casts to make v8 compile without warnings on 64-bit Visual Studio

src/scopeinfo.cc

 // 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 518 matching lines @@
     number_of_locals += number_of_context_slots() - Context::MIN_CONTEXT_SLOTS;
   }
   return number_of_locals;
 }
 
 
 int ContextSlotCache::Hash(Code* code, String* name) {
   // Uses only lower 32 bits if pointers are larger.
   uintptr_t addr_hash =
       static_cast<uint32_t>(reinterpret_cast<uintptr_t>(code)) >> 2;
-  return (addr_hash ^ name->Hash()) % kLength;
+  return static_cast<int>((addr_hash ^ name->Hash()) % kLength);
 }
 
 
 int ContextSlotCache::Lookup(Code* code,
                              String* name,
                              Variable::Mode* mode) {
   int index = Hash(code, name);
   Key& key = keys_[index];
   if ((key.code == code) && key.name->Equals(name)) {
     Value result(values_[index]);
@@ skipping 90 matching lines @@
 }
 #endif  // DEBUG
 
 
 // Make sure the classes get instantiated by the template system.
 template class ScopeInfo<FreeStoreAllocationPolicy>;
 template class ScopeInfo<PreallocatedStorage>;
 template class ScopeInfo<ZoneListAllocationPolicy>;
 
 } }  // namespace v8::internal