   0  getfield_gc_i_pure %r0, FieldDescr<pypy.objspace.std.intobject.W_IntObject.inst_intval> -> %i0
   5  int_eq %i0, $-1 -> %i1
   9  int_sub %i0, %i1 -> %i0
  13  new_with_vtable <rpython.jit.backend.llsupport.descr.SizeDescr object at 0x0000aaab0ce2a138> -> %r0
  17  setfield_gc_i %r0, %i0, FieldDescr<pypy.objspace.std.intobject.W_IntObject.inst_intval>
  22  ref_return %r0
