[issue29461] Experiment usage of likely/unlikely in CPython core

[STINNER Victor]

STINNER Victor added the comment:

Copy of msg287111 (issue #29460), Serhiy Storchaka (serhiy.storchaka):

> The next question might it: would it be worth it to try using unlikely()
> macro on (kwargs == NULL) test in the macro? ;-)

Perhaps this may help in some critical tight loops (in implementations of 
dict, string operations or long integer arithmetic), but I doubt it can have 
any measurable effect when used once per a call of a function calling 
PyArg_Parse* and using many other stuff.

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