[issue21788] Rework Python finalization

[STINNER Victor]

STINNER Victor added the comment:

Benjamin changed ThreadState_DeleteCurrent() to fix an issue in this part of the code, but then reverted his change:
"revert tstate_delete_common, since it's pretty much wrong"
http://hg.python.org/cpython/rev/3ce746735b99

(Yeah this part of the code is really tricky, likely to deadlock.)

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