[issue23591] enum: Add Flags and IntFlags

[Roundup Robot]

Roundup Robot added the comment:

New changeset b56290a80ff7 by Ethan Furman in branch '3.6':
issue23591: fix flag decomposition and repr
https://hg.python.org/cpython/rev/b56290a80ff7

New changeset 7372c042e9a1 by Ethan Furman in branch 'default':
issue23591: fix flag decomposition and repr
https://hg.python.org/cpython/rev/7372c042e9a1

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