(In reply to Michel Dänzer from comment #1)
> Could be a duplicate of bug 100681.

Probably, radv also gives me glitches in The Talos Principle.

Today I updated Mesa to version 1:17.2~git170417160400.ba6c451~z~padoka0 and
the glitches are still there. The llvm SVN revision stays at r300374.

I built the llvm trunk but I have no idea how to ask Mesa to use the build
result (are .so or lib.a used?). If you have any tutorial to run a specific
llvm version with Mesa I would be interested.