Handle pre-allocated properties when copying map

src/objects-debug.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 445 matching lines @@
   }
   return "UNKNOWN";
 }
 
 
 void Map::MapPrint() {
   HeapObject::PrintHeader("Map");
   PrintF(" - type: %s\n", TypeToString(instance_type()));
   PrintF(" - instance size: %d\n", instance_size());
   PrintF(" - inobject properties: %d\n", inobject_properties());
+  PrintF(" - pre-allocated property fields: %d\n",
+      pre_allocated_property_fields());
   PrintF(" - unused property fields: %d\n", unused_property_fields());
   if (is_hidden_prototype()) {
     PrintF(" - hidden_prototype\n");
   }
   if (has_named_interceptor()) {
     PrintF(" - named_interceptor\n");
   }
   if (has_indexed_interceptor()) {
     PrintF(" - indexed_interceptor\n");
   }
@@ skipping 678 matching lines @@
     }
     current = hash;
   }
   return true;
 }
 
 
 #endif  // DEBUG
 
 } }  // namespace v8::internal