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

[STINNER Victor]

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

My first attempt: Add PyThreadState_EnterTracing() and PyThreadState_LeaveTracing()
https://github.com/python/cpython/pull/28542

It adds an abstraction on accesses to PyThreadState.tracing and PyThreadState.cframe.use_tracing members.

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