i am build llvm from
http://cgit.freedesktop.org/~tstellar/llvm/log/?h=si-spill-fixes , and latest
mesa-git

game also freeze. 

output:
/var/tmp/portage/sys-devel/llvm-9999/work/llvm-9999/lib/CodeGen/RegAllocGreedy.cpp:2096:
unsigned int {anonymous}::RAGreedy::selectOrSplitImpl(llvm::LiveInterval&,
llvm::SmallVectorImpl<unsigned int>&, {anonymous}::RAGreedy::SmallVirtRegSet&,
unsigned int): Проверочное утверждение «NewVRegs.empty() && "Cannot append to
existing NewVRegs"»

I like more help?