Patch (SSE3) for faster To(U)Int32 conversion in bit

src/mksnapshot.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 144 matching lines @@
     i::FlagList::PrintHelp();
     return !i::FLAG_help;
   }
 
   v8::V8::SetCounterFunction(counter_callback);
   v8::HandleScope scope;
 
   const int kExtensionCount = 1;
   const char* extension_list[kExtensionCount] = { "v8/gc" };
   v8::ExtensionConfiguration extensions(kExtensionCount, extension_list);
+
+  i::Serializer::Enable();
   v8::Context::New(&extensions);
 
   // Make sure all builtin scripts are cached.
   { HandleScope scope;
     for (int i = 0; i < i::Natives::GetBuiltinsCount(); i++) {
       i::Bootstrapper::NativesSourceLookup(i);
     }
   }
   // Get rid of unreferenced scripts with a global GC.
   i::Heap::CollectAllGarbage();
   i::Serializer ser;
   ser.Serialize();
   v8::internal::byte* bytes;
   int len;
   ser.Finalize(&bytes, &len);
 
   WriteInternalSnapshotToFile(argv[1], bytes, len);
 
   i::DeleteArray(bytes);
 
   return 0;
 }