[patch] Fix for Fir destructor not getting called

[Don McCoy]

This patch fixes a problem in which the Ref_counted_ptr holder's count_
member was being incremented one too many times, resulting in the Fir
destructor not getting called.

The problem occurs because in the dispatch mechanism
(Evaluator::exec()), the Fir_impl backend is created and stored in a
Ref_counted_ptr object, then passed to the Fir class and stored in yet
another Ref_counted_ptr object.  This results in a reference count of 2
after creation, inhibiting the destructor from being called when the Fir
object goes out of scope.

While this does in fact fix the problem, I would like to verify that it
is the correct fix in this case.  Comments?

Regards,

-- 
Don McCoy
don (at) CodeSourcery
(888) 776-0262 / (650) 331-3385, x712

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