[issue16832] Expose cache validity checking support in ABCMeta

[Roundup Robot]

Roundup Robot added the comment:

New changeset 5b17d5ca2ff1 by Łukasz Langa in branch 'default':
Fix #16832 - expose cache validity checking support in ABCMeta
http://hg.python.org/cpython/rev/5b17d5ca2ff1

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nosy: +python-dev

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