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

[STINNER Victor]

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

> FYI, after merging that PR I realized that the COMPUTE_EVAL_BREAKER macro isn't quite right.

I reworked this function in bpo-40010.

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