[issue26558] Fix PyGILState_Check() with _testcapi.run_in_subinterp()

[Roundup Robot]

Roundup Robot added the comment:

New changeset c24630367767 by Victor Stinner in branch 'default':
Fix Py_FatalError() if called without the GIL
https://hg.python.org/cpython/rev/c24630367767

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nosy: +python-dev

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<http://bugs.python.org/issue26558>
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