[fpc-pascal] Optimizer in 2.0

[Peter Vreman]

> It shows with useless code like simple nested for .. to loops, but also
> with some more useful code like the attached RSA_Angriff from the C'T
> magazine.
>
> My results are with:
>
> fpc -Sd -OG3rp3 -XX RSA_Angriff_D5.dpr
>
> 5266 ms
>
> with:
>
> fpc -Sd -XX RSA_Angriff_D5.dpr
>
> 4844 ms
>
> The unoptimized code is faster than the optimized code.

Try without regvars. It is a known issue that register variables don't
produce better code on intel cpus because it increase register pressure.