[issue16991] Add OrderedDict written in C

[Roundup Robot]

Roundup Robot added the comment:

New changeset 0a7380984e37 by Eric Snow in branch '3.5':
Issue #16991: Use PyObject_TypeCheck instead of PyObject_IsInstance.
https://hg.python.org/cpython/rev/0a7380984e37

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<http://bugs.python.org/issue16991>
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