[issue38147] add Py_ASSUME() macro for __builtin_unreachable()

[STINNER Victor]

Change by STINNER Victor <vstinner at python.org>:


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title: add macro for __builtin_unreachable -> add Py_ASSUME() macro for __builtin_unreachable()

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38147>
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