[issue16991] Add OrderedDict written in C

[Eric Snow]

Eric Snow added the comment:

I've updated the cordereddict branch on the feature repo to fix the ref leak on None.  I'm still seeing other leaks (regrtest -R 3:3), but I don't think that should block landing before the feature freeze.

However, I'm concerned about a segfault I'm seeing roughly 3% of the time when running the following:

  ./python -m unittest test.test_configparser.ConfigParserTestCase.test_basic

Presumably there is a dealloc bug there which manifests intermittently due to a GC race.  I'm going work on tracking it down but help is appreciated. :)

I'm also seeing consistent test failures in test_enum.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16991>
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