[issue45247] Add explicit support for Cython to the C API.

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

We need to add C API to abstract access to structures used by Cython:

* bpo-39947: PyThreadState
* bpo-40421: PyFrameObject

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nosy: +vstinner

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45247>
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