[issue38249] Optimize out Py_UNREACHABLE in the release mode

[STINNER Victor]

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

Ah, moreover, it's a public macro, so I would prefer to not change its behavior. I consider that modify the macro to call __builtin_unreachable() changes the behavior.

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<https://bugs.python.org/issue38249>
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