https://bugs.freedesktop.org/show_bug.cgi?id=89699

--- Comment #13 from Sergio Pais sp@srge.org --- After I posted the comment I noticed it was reverted. I compiled 82b7ee62fc4bbe014f61a60bccf694b706c7247d and the artifacts are still present. There might be two different changes that cause a similar bug? I'll try to narrow it down.