[issue37017] Use LOAD_METHOD optimization in CallMethod C API functions

[Inada Naoki]

Inada Naoki <songofacandy at gmail.com> added the comment:

I want to wait this until PEP 590 is implemented.

Unlike CALL_METHOD, we can not avoid prepending self.

New method signature may be like this:

PyObject_VectorCallMethod(PyObject *name, PyObject **args, Py_ssize_t nargs, PyObject *kwds);

And args[0] is self.  With API like this, we can avoid prepending self.

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nosy: +inada.naoki

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