SF bug 681122: Built-in function dir() causes refcount leak in baseclasses.
SF bug 681122: Built-in function dir() causes refcount leak in baseclasses.

merge_class_dict():  This was missing a decref.

Bugfix candidate.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator