[issue16991] Add OrderedDict written in C

[Roundup Robot]

Roundup Robot added the comment:

New changeset 7117e9b0f595 by Eric Snow in branch '3.5':
Issue #16991: Drop Py_ODict_GetItemId.
https://hg.python.org/cpython/rev/7117e9b0f595

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