Issue #13389: Full garbage collection passes now clear the freelists for

list and dict objects.  They already cleared other freelists in the
interpreter.

Doc/c-api/list.rst

@@ -142,3 +142,10 @@ List Objects
 
    Return a new tuple object containing the contents of *list*; equivalent to
    ``tuple(list)``.
+
+
+.. c:function:: int PyList_ClearFreeList()
+
+   Clear the free list. Return the total number of freed items.
+
+   .. versionadded:: 3.3