[issue37774] Micro-optimize vectorcall using PY_LIKELY

[Ma Lin]

Ma Lin <malincns at 163.com> added the comment:

How about write a suggestion on when to use them in the comment?

For example:
> You should use it only in cases when the likeliest branch is
> very very very likely, or when the unlikeliest branch is very
> very very unlikely. 
from https://kernelnewbies.org/FAQ/LikelyUnlikely

Another discussion about them:
https://lwn.net/Articles/420019/

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nosy: +Ma Lin

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