[issue37774] Micro-optimize vectorcall using PY_LIKELY

[Jeroen Demeyer]

Jeroen Demeyer <jeroen.k.demeyer at gmail.com> added the comment:

I claim that adding Py_LIKELY/Py_UNLIKELY will reduce the performance randomness of non-PGO builds. So it would be strange to use that randomness as an argument *against* this patch.

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<https://bugs.python.org/issue37774>
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