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

[Raymond Hettinger]

Raymond Hettinger added the comment:

Will deeply grokking this code, I would say to leave it alone.  The test seems reasonable and is very fast (likely free of cost on many machines).

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nosy: +georg.brandl, pitrou
priority: normal -> low

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<http://bugs.python.org/issue30230>
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