[issue45439] [C API] Move usage of tp_vectorcall_offset from public headers to the internal C API

[STINNER Victor]

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


Added file: https://bugs.python.org/file50350/test_bench2.patch

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45439>
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