Challenge: write a really really small front() for UTF8

[dnspies]

On Sunday, 23 March 2014 at 21:23:18 UTC, Andrei Alexandrescu 
wrote:
> Here's a baseline: http://goo.gl/91vIGc. Destroy!
>
> Andrei

Ok, I managed to make it smaller.  I think this is the smallest 
so far with only 23 instructions (no loop unrolling in this one):

http://goo.gl/RKF5Vm