https://bugs.freedesktop.org/show_bug.cgi?id=104932
--- Comment #5 from Robin Kauffman robink@creosotehill.org --- (In reply to Michel Dänzer from comment #4)
Which versions of Mesa & LLVM are you using?
LLVM & Clang 7.0 Git, LLVM commit e0c16f05e9fbc1dcd291814ceab9dbc5, Clang commit e0c16f05e9fbc1dcd291814ceab9dbc5. Both were merged 2018/01/31. Let me know if you need more detail.