[issue25410] Clean up and fix OrderedDict

[Roundup Robot]

Roundup Robot added the comment:

New changeset b6e33798f82a by Serhiy Storchaka in branch '3.5':
Issue #25410: Cleaned up and fixed minor bugs in C implementation of OrderedDict.
https://hg.python.org/cpython/rev/b6e33798f82a

New changeset 741ef17e9b86 by Serhiy Storchaka in branch 'default':
Issue #25410: Cleaned up and fixed minor bugs in C implementation of OrderedDict.
https://hg.python.org/cpython/rev/741ef17e9b86

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nosy: +python-dev

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