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