   0  new_with_vtable <rpython.jit.backend.llsupport.descr.SizeDescr object at 0x1009484be10> -> %r0
   4  -live- %r0
   4  goto_if_not_ptr_iszero %r0, L1
   8  ref_return $<* struct pypy.interpreter.baseobjspace.W_Root>
  10  ---
  10  L1:
  10  ref_return %r0
