[IronPython] Possible WeakReference leak in Ipy 2.6.1

[Idan Zaltzberg]

When definnning classes in a method that are subcallses, like:

def d():

                class A(BaseType): pass

                …

The new generated types is appended to the _subtypes weak reference list on
BaseType.

Looks like this list is only cleaned when RemoveSubType Is called, which
might never happen if I understand correctly.



Seems to me there should be a cleanup mechanism similar to WeakDictionary,
so the list can't grow to infinity.
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