[patch] function eval cleanup

[sami wagiaalla]

>
> In this particular location and if the language is C++ we are dealing
> with an OP_VAR_VALUE since all the other constructs were eliminated by
> the if else chain. So it is always a symbol, but I could add a check for
> OP_VAR_VALUE before skipping evaluation.
>

Tom pointed out that the catch all is also responsible for evaluating 
complex expressions describing function pointers. So I added a check for 
OP_VAR_VALUE, and a test-case for the missed scenario.

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