[issue30509] Optimize calling type slots

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Despite the fact that `a + b` still is slower than `a.__add__(b)` in 3.7, it is more than 2 times faster than in 2.7 and 3.5.

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