Slight improvement of object printer for maps.

src/objects-printer.cc

 // Copyright 2012 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 578 matching lines @@
     PrintF(out, " - undetectable\n");
   }
   if (has_instance_call_handler()) {
     PrintF(out, " - instance_call_handler\n");
   }
   if (is_access_check_needed()) {
     PrintF(out, " - access_check_needed\n");
   }
   PrintF(out, " - back pointer: ");
   GetBackPointer()->ShortPrint(out);
-  PrintF(out, "\n - instance descriptors %i #%i: ",
-         owns_descriptors(),
+  PrintF(out, "\n - instance descriptors %s#%i: ",
+         owns_descriptors() ? "(own) " : "",
          NumberOfOwnDescriptors());
   instance_descriptors()->ShortPrint(out);
   if (HasTransitionArray()) {
     PrintF(out, "\n - transitions: ");
     transitions()->ShortPrint(out);
   }
   PrintF(out, "\n - prototype: ");
   prototype()->ShortPrint(out);
   PrintF(out, "\n - constructor: ");
   constructor()->ShortPrint(out);
@@ skipping 596 matching lines @@
     }
   }
   PrintF(out, "\n");
 }
 
 
 #endif  // OBJECT_PRINT
 
 
 } }  // namespace v8::internal