[issue37483] Add PyObject_CallOneArg()

[Jeroen Demeyer]

Jeroen Demeyer <J.Demeyer at UGent.be> added the comment:

> Is there any benchmark showing if it's faster

Here is one example:

class D(dict):
    def __missing__(self, key):
        return None
d = D()

and now benchmark d[0]

**before**: Mean +- std dev: 173 ns +- 1 ns
**after**: Mean +- std dev: 162 ns +- 1 ns

To be precise, I ran: ./python -m perf timeit --duplicate 200 -s 'class D(dict):' -s ' def __missing__(self, key):' -s '  return None' -s 'd = D()' 'd[0]'

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<https://bugs.python.org/issue37483>
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