[issue23591] enum: Add Flags and IntFlags

[Roundup Robot]

Roundup Robot added the comment:

New changeset 39661e2ff030 by Ethan Furman in branch 'default':
issue23591: add Flags, IntFlags, and tests
https://hg.python.org/cpython/rev/39661e2ff030

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nosy: +python-dev

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