At moment sun shader in build 59607 don't cause GPU lockup, but have exactly
same error. Also LLVM shader compiler can't handle it properly so it's only
partially compile it.

Newer versions of game completely broken for open source drivers due to
dependency on OpenGL 3.2 compatibility profile that isn't supported in Mesa:
http://pa.lennardf1989.com/Tracker/index.php?do=details&task_id=3057
I tried to bypass this problem but stuck on new GPU lockup, but I didn't report
it because it's can be related to how I bypass crashes.

Anyway I suppose when developers change code to use 3.2 context game will work
on Intel drivers, but there will be one more GPU lockup on R600g.