Add elements kind to maps debugging output

src/objects-printer.cc

 // Copyright 2011 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 514 matching lines @@
     default: return "UNKNOWN";
   }
 }
 
 
 void Map::MapPrint(FILE* out) {
   HeapObject::PrintHeader(out, "Map");
   PrintF(out, " - type: %s\n", TypeToString(instance_type()));
   PrintF(out, " - instance size: %d\n", instance_size());
   PrintF(out, " - inobject properties: %d\n", inobject_properties());
-  PrintF(out, " - pre-allocated property fields: %d\n",
+  PrintF(out, " - elements kind: ");
+  PrintElementsKind(out, elements_kind());
+  PrintF(out, "\n - pre-allocated property fields: %d\n",
       pre_allocated_property_fields());
   PrintF(out, " - unused property fields: %d\n", unused_property_fields());
   if (is_hidden_prototype()) {
     PrintF(out, " - hidden_prototype\n");
   }
   if (has_named_interceptor()) {
     PrintF(out, " - named_interceptor\n");
   }
   if (has_indexed_interceptor()) {
     PrintF(out, " - indexed_interceptor\n");
@@ skipping 434 matching lines @@
     desc.Print(out);
   }
   PrintF(out, "\n");
 }
 
 
 #endif  // OBJECT_PRINT
 
 
 } }  // namespace v8::internal