   0  inline_call_r_i <JitCode 'c_int_w'>, R[%r0] -> %i0
   6  -live- %i0, %r1
   9  inline_call_r_i <JitCode 'c_int_w'>, R[%r1] -> %i1
  15  -live- %i0, %i1
  18  inline_call_ir_r <JitCode 'waitpid'>, I[%i0, %i1], R[] -> %r0
  26  -live- %r0
  29  ref_return %r0
