https://bugs.freedesktop.org/show_bug.cgi?id=110214
--- Comment #38 from Diego Viola diego.viola@gmail.com --- (In reply to Michel Dänzer from comment #37)
Hmm, Mesa was built against LLVM 7 in Arch & Fedora, against LLVM 8/9 in Ubuntu. Maybe this was an LLVM issue fixed in version 8?
Unfortunately that's not the issue, llvm-libs 8.0.0 just landed on Arch Linux [extra] repository and the issue still persists.