   0  getfield_gc_i %r0, FieldDescr<rpython.rlib.rmmap.MMap.inst_access> -> %i0
   5  -live- %i0
   5  goto_if_not_int_ne %i0, $1, L1
  10  void_return
  11  ---
  11  L1:
  11  new_with_vtable <rpython.jit.backend.llsupport.descr.SizeDescr object at 0x00000001b17a2bf0> -> %r0
  15  setfield_gc_r %r0, $<* struct rpy_string>, FieldDescr<rpython.rlib.rmmap.RMMapError.inst_message>
  20  assert_not_none %r0
  22  -live- %r0
  22  guard_class %r0 -> %i0
  25  -live- %r0
  25  raise %r0
