I'll do that now, although I did include my graphics card and drivers in the ticket description.
Well that's curious indeed, since I have both an AMD CPU and GPU. Also, the ticket this is supposedly a duplicate of doesn't include anything about an illegal instruction exception, just the access violation.
Still present in 1.9 snapshots (as of 15w35a). The sheep I saw didn't seem to be suffocating, though.
Confirmed (I was actually going to create a ticket myself). They literally have no AI whatsoever.
Edit: B snapshot is on its way
Confirmed for 1.8.7. This will occur for any data value whose last two bits are 10 or 11.
I'm already on the latest version (15.20.1062.1004), as denoted in the ticket.