[issue15475] Correct __sizeof__ support for itertools

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Georg, sorry, I don't understood you. You have no objection to the inclusion 
of this patch in 3.3.0 or you say that this patch should not be in 3.3.0?

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<http://bugs.python.org/issue15475>
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