   0  residual_call_ir_i $<* fn ll_os.WIFSTOPPED>, I[%i0], R[], <CallDescr(i) EF=7> -> %i0
   8  -live- %i0
   8  -live- %i0
   8  goto_if_not %i0, L1
  12  ref_return $<* struct pypy.interpreter.baseobjspace.W_Root>
  14  ---
  14  L1:
  14  ref_return $<* struct pypy.interpreter.baseobjspace.W_Root>
