[issue28618] Decorate hot functions using __attribute__((hot)) to optimize Python

[STINNER Victor]

STINNER Victor added the comment:

> But I failed to reproduce it.

Hey, performance issues with code placement is a mysterious secret :-)
Nobody understands it :-D

The server runner the benchmark is a Intel Xeon CPU of 2011. It seems
like code placement issues are more important on this CPU than my more
recent laptop or desktop PC.

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<http://bugs.python.org/issue28618>
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