Comment # 9 on bug 98238 from Arek Ruśniak

I've  forgot to mention, in both case I've build mesa against LLVM 3.9.0
(official arch packages)
I cannot simply revert ab29788250a705eb0dd517cb3d38f37f944eb8ad
I had compile errors with LLVM 4.0, didn't try 3.8.x.