Comment # 4 on bug 65016 from Alexander Tsoy

Thanks for the answer. I suspected something like this when saw this in
backstrace:

#2  0x0000039278c97590 in llvm::llvm_unreachable_internal (msg=0x39278d885ea
"Undefined function", file=0x39278d885d5 "AMDGPUISelLowering.h", line=56) at
ErrorHandling.cpp:98