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

[INADA Naoki]

INADA Naoki added the comment:

While I feel your work is great, performance benefit seems very small,
compared complexity of this patch.

I think AST level optimize is more important. co_const and co_stacksize
can be more small if constant folding is done in AST.

And I think global cache (#10401 or #28158) is important too.

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<http://bugs.python.org/issue29259>
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