[issue2115] __slots__ make attribute setting 10x slower

[Christian Heimes]

Christian Heimes added the comment:

Thomas Heller wrote:
> BTW; calling PyObject_GetAttr() with interned strings for
> "__instancecheck__" and "__subclasscheck__" brings not enough speedup.

I've implemented the interning as static PyObject* in r60822. It should
give a small speedup.

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