I'm terribly sorry. Please also ignore my previous player.log files, as they
were recorded with llvm-3.6.0. I now finally managed to get a working
installation of llvm git master and mesa 10.5.2 (with  a few bolts and nuts
from mesa git master), and while the game is stuttering slightly, it indeed
doesn't crash with the current git version of llvm, at least not in the parts
I've tested up to now.