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

[STINNER Victor]

STINNER Victor added the comment:

> Can we commit this to 3.6 too?

I worked on patches to try to optimize json_loads and regex_effbot as well, but it's still unclear to me how the hot attribute works, and I'm not 100% sure that using the attribut explicitly does not introduce a performance regession.

So I prefer to experiment such change in default right now.

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