Fix CNLT regression.

src/objects-printer.cc

Index: src/objects-printer.cc
diff --git a/src/objects-printer.cc b/src/objects-printer.cc
index 1ba0bb0d0988780dd6437e797ca25c1ac7f971b5..40572906790ac01961e4b742c45fdc49940a53b1 100644
--- a/src/objects-printer.cc
+++ b/src/objects-printer.cc
@@ -562,7 +562,12 @@ void Map::MapPrint(FILE* out) {
   if (is_access_check_needed()) {
     PrintF(out, " - access_check_needed\n");
   }
-  PrintF(out, " - instance descriptors: ");
+  PrintF(out, " - back pointer: ");
+  GetBackPointer()->ShortPrint(out);
+  PrintF(out, "\n - instance descriptors %i #%i %i: ",
+         owns_descriptors(),
+         NumberOfOwnDescriptors(),
+         StoresOwnDescriptors());
   instance_descriptors()->ShortPrint(out);
   if (HasTransitionArray()) {
     PrintF(out, "\n - transitions: ");