[issue24254] Make class definition namespace ordered by default

[Nick Coghlan]

Nick Coghlan added the comment:

Because we're not making ordered-by-default dicts a language specification level requirement, so portable code can't rely on them.

However, the PEP at https://www.python.org/dev/peps/pep-0520/ is deliberately worded so that there's no requirement for the class body execution namespace to specifically be collections.OrderedDict - it just needs to be order preserving so that __definition_order__ can be populated.

If someone reviews and merges the compact ordered dict patch, then this patch can likely be made a lot simpler.

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<https://bugs.python.org/issue24254>
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