[issue30230] Move quick test in PyObject_IsSubClass outside of PyType_CheckExact guard

[Raymond Hettinger]

Raymond Hettinger added the comment:

My point was that it isn't wise to propose PRs for code you don't fully understand (he said, "I'm not sure if this was placed inside there due to some wild edge-case,").

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30230>
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