Cache maps when normalizing properties....

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 1371 matching lines @@
   ;
 
   Handle<FixedArray> caches = Factory::NewFixedArray(kNumberOfCaches, TENURED);
 
   int index = 0;
 #define F(size, func) caches->set(index++, CreateCache(size, func));
     JSFUNCTION_RESULT_CACHE_LIST(F)
 #undef F
 
   global_context()->set_jsfunction_result_caches(*caches);
+
+  Handle<FixedArray> slow_map_cache = Factory::NewFixedArray(0x100, TENURED);
+  global_context()->set_slow_map_cache(*slow_map_cache);
 }
 
 
 int BootstrapperActive::nesting_ = 0;
 
 
 bool Bootstrapper::InstallExtensions(Handle<Context> global_context,
                                      v8::ExtensionConfiguration* extensions) {
   BootstrapperActive active;
   SaveContext saved_context;
@@ skipping 408 matching lines @@
 }
 
 
 // Restore statics that are thread local.
 char* BootstrapperActive::RestoreState(char* from) {
   nesting_ = *reinterpret_cast<int*>(from);
   return from + sizeof(nesting_);
 }
 
 } }  // namespace v8::internal