[issue31336] Speed up _PyType_Lookup() for class creation

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

What names are looked up when you create an empty class?

I'm surprised that this change has measurable performance effect. Aren't name an interned string with precalculated cache?

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nosy: +haypo, inada.naoki, pitrou, rhettinger

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<http://bugs.python.org/issue31336>
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