[issue29465] Add _PyObject_FastCall() to reduce stack consumption

[STINNER Victor]

STINNER Victor added the comment:

Oh, pyobject_fastcall-3.patch contains a performance bug :-p PyObject_Call() "unpacks" the tuple and then recreates a new tuple to call functions in for functions other than Python and C functions.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29465>
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