https://bugs.freedesktop.org/show_bug.cgi?id=88925
--- Comment #3 from dex+fdobugzilla@dragonslave.de --- (In reply to Michel Dänzer from comment #2)
Sounds like bug 80419.
Possible. But the game worked fine until about start of the year. I think I may still have the packaged versions of llvm and mesa from then and perhaps I can confirm this.
I strongly suspect LLVM being the culprit here.