[issue29460] Speed up _PyArg_NoKeywords() and like

[STINNER Victor]

STINNER Victor added the comment:

Oh right, I recall that I proposed it. Thanks for this change :-)

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

I'm talking about GCC/Clang __builtin_expect:

#define unlikely(x)     __builtin_expect((x),0)

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