Comment # 34 on bug 75276 from Michel Dänzer

(In reply to comment #33)
> > So I built mesa with debug symbols and I guess debugging enables some
> > assertions because now fails at some assertion about Register.Index stuff.
> 
> Yep, that looks like bug 81834.

BTW, you may be able to work around this by reverting Mesa commit
f4b0ab7afd83c811329211eae8167c9bf238870c, but then you may run into bug 80880
instead.