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

[STINNER Victor]

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

Note: Hai Shi is working hard on converting modules to multiphase module initialization (PEP 489) which helps to cleanup the Python state at exit, and subinterpreters will likely benefit of that. This issue is related to this work.

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