[issue16792] Mark small ints test as CPython-only

[Roundup Robot]

Roundup Robot added the comment:

New changeset 327896bf3152 by Serhiy Storchaka in branch '2.7':
Issue #16792: Use assertIs() to test identity.
http://hg.python.org/cpython/rev/327896bf3152

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<http://bugs.python.org/issue16792>
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