   0  -live- %r1
   0  guard_class %r1 -> %i0
   3  getfield_raw_i %i0, FieldDescr<pypy.interpreter.baseobjspace.W_Root_vtable.cls_typecode> -> %i0
   8  newstr $1 -> %r0
  11  strsetitem %r0, $0, %i0
  15  -live- %r0
  15  goto_if_not_ptr_iszero %r0, L1
  19  ref_return $<* struct pypy.interpreter.baseobjspace.W_Root>
  21  ---
  21  L1:
  21  new_with_vtable <rpython.jit.backend.llsupport.descr.SizeDescr object at 0x10096124f10> -> %r1
  25  setfield_gc_r %r1, %r0, FieldDescr<pypy.objspace.std.bytesobject.W_BytesObject.inst__value>
  30  ref_return %r1
