[issue28293] Don't completely dump the regex cache when full

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

> Maybe use OrderedDict? But this adds heavy dependency to the re module.

We can use the same trick as in the enum module. Here is a patch.

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Added file: http://bugs.python.org/file44854/re_cache_ordered_dict_del_first.patch

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<http://bugs.python.org/issue28293>
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