[issue23571] Raise SystemError if a function returns a result with an exception set

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

> If the patch has a significant overhead: _Py_CheckFunctionResult() may be
> marked to be inlined, and PyCFunction_Call() and PyObject_Call() checks may
> be marked as unlikely using GCC __builtin_expect(), something like:

Could you please open separate issue or even a topic on Python-Ideas for 
Py_likely/Py_unlikely? I prefer spelling _Py_LIKELY.

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<http://bugs.python.org/issue23571>
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