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

[STINNER Victor]

STINNER Victor added the comment:

> How about marking lookdict_unicode and lookdict_unicode_nodummy as hot?

Ok, your benchmark results doens't look bad, so I marked the following functions as hot:

- lookdict
- lookdict_unicode
- lookdict_unicode_nodummy
- lookdict_split

It's common to see these functions in the top 3 of "perf report".

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