[issue24681] Put most likely test first in set_add_entry()

[STINNER Victor]

STINNER Victor added the comment:

> You can benchmark if you want.

No, you have to provide a benchmark if you want to modify the Python core to optimize it. Otherwise, modifying the code is pointless.

It's a general rule in Python to optimize code. We don't accept optimization changes if it has no effect on performances.

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