[issue29465] Add _PyObject_FastCall() to reduce stack consumption

[STINNER Victor]

STINNER Victor added the comment:

I splitted my big patch into smaller changes, see my pull request:
https://github.com/python/cpython/pull/74

If you prefer Rietveld ([Review] button), I also attached the squashed change: pyobject_fastcall-5.patch.

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Added file: http://bugs.python.org/file46599/pyobject_fastcall-5.patch

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