Allocate room for expected number of properties based on the...

src/bootstrapper.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 1143 matching lines @@
       if (stream.eos()) break;
       // We have to read out the next offset before we do anything that may
       // cause a gc, since the DescriptorReader is not gc safe.
       offset = stream.next_position();
       PropertyDetails details = stream.GetDetails();
       switch (details.type()) {
         case FIELD: {
           HandleScope inner;
           Handle<String> key = Handle<String>(stream.GetKey());
           int index = stream.GetFieldIndex();
-          Handle<Object> value = Handle<Object>(from->properties()->get(index));
+          Handle<Object> value = Handle<Object>(from->FastPropertyAt(index));
           SetProperty(to, key, value, details.attributes());
           break;
         }
         case CONSTANT_FUNCTION: {
           HandleScope inner;
           Handle<String> key = Handle<String>(stream.GetKey());
           Handle<JSFunction> fun =
               Handle<JSFunction>(stream.GetConstantFunction());
           SetProperty(to, key, fun, details.attributes());
           break;
@@ skipping 159 matching lines @@
   if (!ConfigureGlobalObject(global_template)) return;
 
   if (!InstallExtensions(extensions)) return;
 
   if (!InstallSpecialObjects()) return;
 
   result_ = global_context_;
 }
 
 } }  // namespace v8::internal