[issue29465] Add _PyObject_FastCall() to reduce stack consumption

[STINNER Victor]

STINNER Victor added the comment:

Oh, I forgot to rebase my local git branch: patch version 2 contains unrelated changes. Please see instead the path version 3 which was rebased.

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Added file: http://bugs.python.org/file46554/pyobject_fastcall-3.patch

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