[issue2898] Add memory footprint query

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

I'm torn about the extra slot; I'd rather not add one, but I can't see
how to make this flexible enough without one.

It should definitely not be a built-in; the sys module is fine though
(e.g. sys.getrefcount() lives there too).

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