[issue29259] Add tp_fastcall to PyTypeObject: support FASTCALL calling convention for all callable objects

[INADA Naoki]

INADA Naoki added the comment:

1. _PyCFunction_FastCallKeywords() calls _PyStack_AsDict(), then calls _PyCFunction_FastCallDict().
2. _PyCFunction_FastCallDict() calls _Py_FastCall_FromArgs() when METH_FASTCALL.
3. _Py_FastCall_FromArgs() calls _PyStack_UnpackDict(), then calls fastcall().

Can you remove this _PyStack_AsDict() & _PyStack_UnpackDict() by creating shortcut in _PyCFunction_FastCallKeywords()?

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29259>
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