   0  -live- %r0
   0  guard_class %r0 -> %i0
   3  getfield_raw_i %i0, FieldDescr<pypy.module._cffi_backend.cdataobj.W_CData_vtable.cls_enter_exit> -> %i0
   8  -live- %i0, %r0
   8  int_guard_value %i0
  10  residual_call_ir_v %i0, <IndirectCallTargets>, I[$False], R[%r0], <CallDescr(ri) EF=7>
  18  -live- %r0
  18  ref_return %r0
