[issue39968] port extension modules' macros of `get_module_state()` to inline function.

[STINNER Victor]

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

Oh, I forgot a cool advantage that I discovered late: debuggers and profilers understand inlined code and are able to get the name of the static inline function, whereas it's not possible to do that with macros. If I recall correctly, it works even if the function is inlined.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39968>
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