Don't create new maps in CurrentMapForDeprecated.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index d466f6571515d3eeb8aaf5b082f7591c36cfd89c..2c31f30466c301982bab631d2aa6027a2908c68c 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -5377,9 +5377,8 @@ class Map: public HeapObject {
   // Returns a non-deprecated version of the input. If the input was not
   // deprecated, it is directly returned. Otherwise, the non-deprecated version
   // is found by re-transitioning from the root of the transition tree using the
-  // descriptor array of the map. New maps (and transitions) may be created if
-  // no new (more general) version exists.
-  static inline Handle<Map> CurrentMapForDeprecated(Handle<Map> map);
+  // descriptor array of the map. Returns NULL if no updated map is found.
+  Map* CurrentMapForDeprecated();
 
   MUST_USE_RESULT MaybeObject* RawCopy(int instance_size);
   MUST_USE_RESULT MaybeObject* CopyWithPreallocatedFieldDescriptors();