Cache multiple ElementsKind map transition per map.

src/objects-printer.cc

Index: src/objects-printer.cc
diff --git a/src/objects-printer.cc b/src/objects-printer.cc
index 6e80515253c885ed672cf57a789b04825d60b092..aac79a65a86a6f9a410ea52754d44ef4e1f893e4 100644
--- a/src/objects-printer.cc
+++ b/src/objects-printer.cc
@@ -315,12 +315,25 @@ void JSObject::PrintProperties(FILE* out) {
           descs->GetCallbacksObject(i)->ShortPrint(out);
           PrintF(out, " (callback)\n");
           break;
-        case ELEMENTS_TRANSITION:
+        case ELEMENTS_TRANSITION: {
           PrintF(out, "(elements transition to ");
-          PrintElementsKind(out,
-                            Map::cast(descs->GetValue(i))->elements_kind());
+          Object* descriptor_contents = descs->GetValue(i);
+          if (descriptor_contents->IsMap()) {
+            Map* map = Map::cast(descriptor_contents);
+            PrintElementsKind(out, map->elements_kind());
+          } else {
+            FixedArray* map_array = FixedArray::cast(descriptor_contents);
+            for (int i = 0; i < map_array->length(); ++i) {
+              Map* map = Map::cast(map_array->get(i));
+              if (i != 0) {
+                PrintF(out, ", ");
+              }
+              PrintElementsKind(out, map->elements_kind());
+            }
+          }
           PrintF(out, ")\n");
           break;
+        }
         case MAP_TRANSITION:
           PrintF(out, "(map transition)\n");
           break;