[issue23591] enum: Add Flags and IntFlags

[Roundup Robot]

Roundup Robot added the comment:

New changeset aad7443e62be by Ethan Furman in branch 'default':
issue23591: add auto() for auto-generating Enum member values
https://hg.python.org/cpython/rev/aad7443e62be

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<http://bugs.python.org/issue23591>
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