Not sure if it is exactly related to this bug, but I can't play
NeverWinterNight, I get a lot of blocs like these:

LLVM triggered Diagnostic Handler: SIInstrInfo::storeRegToStackSlot - Do not
know how to spill register
LLVM triggered Diagnostic Handler: SIInstrInfo::loadRegFromStackSlot - Do not
know how to restore register
LLVM triggered Diagnostic Handler: Ran out of VGPRs for spilling SGPR
then:
radeon_llvm_compile: Processing Diag Flag
LLVM failed to compile shader
EE si_state.c:2282 si_shader_select - Failed to build shader variant (type=1) 1
and then back to above

I'm on git for llvm, clang, mesa (radeonsi).
Using Linux 3.17.2, x64 if that matters.