Comment # 10 on bug 102500 from Arek Ruśniak

additional info:
I try figure out why in my earlier test everything went ok and probably mesa is
the trigger, 

Linux-amd-staging + Mesa-git + LLVM-svn - failure
Linux-amd-staging + Mesa-git + LLVM 4.0.1 - failure
Linux-amd-staging + Mesa 17.1.8 + LLVM 4.0.1 - works ok. 
I try later some bisecting, we will see.