Comment # 17 on bug 1042764 from Takashi Iwai

OK, I spotted out the upstream fix on openSUSE Leap 42.3 / SLE12-SP3.
Interestingly, it's rather an unintended casual fix, judging from the patch
description.

The upstream commit 24d4fbe226c1f5b9a216d05c25737b4b14391975
 radeonsi: strengthen emit_optimization_barrier

contains the code to add a call of LLVMInitializeAMDGPUAsmParser() in
init_amdgpu_target(), and this oneliner fixes the problem.

I'm going to submit SLE12-SP3 fix.

A similar fix should be applicable to openSUSE Leap 42.2, too.  I'll test it.