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

[STINNER Victor]

STINNER Victor added the comment:

Naoki wants to use FASTCALL for CALL_METHOD:
http://bugs.python.org/issue26110#msg283093

tp_fastcall should allow to easily implement it.

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