[issue30509] Optimize calling type slots

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I have other patch that makes `a + b` yet tens percents faster, faster than `a.__add__(b)`, by adding functions and declarations that are never used. Confusing.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30509>
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