[issue4941] Tell GCC Py_DECREF is unlikely to call the destructor

[Paolo 'Blaisorblade' Giarrusso]

Paolo 'Blaisorblade' Giarrusso <p.giarrusso at gmail.com> added the comment:

Also, GCC 2.95 does not support the construct, GCC 2.96 is required.
So, I'd suggest defining likely/unlikely unconditionally and using this,
which leads to less code overall:

#  if (__GNUC__ < 2) || ((__GNUC__ == 2) && (__GNUC_MINOR__ <= 95))
#  define __builtin_expect(exp, prediction)  (exp)
#  endif

This is the simplest way to code this, assuming that ICC defines
__GNUC__, and my reference guide tells "yes, it defines __GNUC__ and
__INTEL_COMPILER".

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<http://bugs.python.org/issue4941>
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