Confirmed, both piglit tests scalar-arithmetic-long.cl and
scalar-arithmetic-ulong.cl tests show the following error (__udivdi3 for
ulong):

0x1cb47c0: i32 = ExternalSymbol'__divdi3'
Undefined function
UNREACHABLE executed at /src/llvm/lib/Target/R600/AMDGPUISelLowering.h:77!
Stack dump:
0.      Running pass 'Function Pass Manager' on module 'radeon'.
1.      Running pass 'AMDGPU DAG->DAG Pattern Instruction Selection' on
function '@div'