[issue33608] Add a cross-interpreter-safe mechanism to indicate that an object may be destroyed.

[Eric Snow]

Eric Snow <ericsnowcurrently at gmail.com> added the comment:

As a lesser (IMHO) alternative, we could also modify Py_DECREF
to respect a new "shared" marker of some sort (perhaps relative
to #33607), but that would probably still require one of the
refcount-based solutions (and add a branch to Py_DECREF).

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versions: +Python 3.8 -Python 3.4

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<https://bugs.python.org/issue33608>
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