[issue22540] speed up isinstance and issubclass for the usual cases

[Georg Brandl]

Georg Brandl added the comment:

Addressing review comments.

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Added file: http://bugs.python.org/file36789/pyobject_issubclass_isinstance_speedup_v2.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22540>
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