   0  -live- %r1
   3  goto_if_not_ptr_nonzero %r1, L1
   7  ref_copy %r1 -> %r0
  10  -live- %r0, %r1
  13  guard_class %r1 -> %i0
  16  -live- %i0, %r0
  19  goto_if_not_int_eq %i0, $<* struct object_vtable>, L2
  24  residual_call_r_r $<* fn W_AppLevelHooks.descr_get_on_gc_collect_step>, R[%r0], <CallDescr(r) EF=2> -> %r0
  31  ref_return %r0
  33  ---
  33  L2:
  33  L3:
  33  raise $<* struct object>
  35  ---
  35  L1:
  35  goto L3
