Replace PyObject_CallFunctionObjArgs() with fastcall

* PyObject_CallFunctionObjArgs(func, NULL) => _PyObject_CallNoArg(func)
* PyObject_CallFunctionObjArgs(func, arg, NULL) => _PyObject_CallArg1(func, arg)

PyObject_CallFunctionObjArgs() allocates 40 bytes on the C stack and requires
extra work to "parse" C arguments to build a C array of PyObject*.

_PyObject_CallNoArg() and _PyObject_CallArg1() are simpler and don't allocate
memory on the C stack.

This change is part of the fastcall project. The change on listsort() is
related to the issue #23507.

Python/sysmodule.c

@@ -1098,7 +1098,7 @@ _PySys_GetSizeOf(PyObject *o)
                          Py_TYPE(o)->tp_name);
     }
     else {
-        res = PyObject_CallFunctionObjArgs(method, NULL);
+        res = _PyObject_CallNoArg(method);
         Py_DECREF(method);
     }