(In reply to sarnex from comment #5)
> I compiled LLVM3.5 debug and Mesa debug, so hopefully there is enough
> information here. The backtrace is attached.

That's a crash in LLVM. Does that also happen with Mesa commit
54de7099115502c561f5f51095e08dc0a52c71b7? If not, can you test my patch on top
of that?