[issue29507] Use FASTCALL in call_method() to avoid temporary tuple

[INADA Naoki]

INADA Naoki added the comment:

> I'm not sure about the change on PyObject_CallMethod*() only for empty format string.

There are many place using _PyObject_CallMethodId() to call method without args.
Maybe, we should recommend to use _PyObject_CallMethodIdObjArgs() when no arguments, and replace all caller in cpython?

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29507>
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