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

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

The patch changes behavior. With the patch it would be possible that after successful set.add(), the item will be not contained in the set. And this behavior is not consistent with dict behavior.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue24681>
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