   0  inline_call_ir_r <JitCode 'interp_w__W_Weakref'>, I[$False], R[%r0] -> %r0
   8  -live- %r0
   8  residual_call_r_r $<* fn W_WeakrefBase.dereference>, R[%r0], <CallDescr(r) EF=2> -> %r0
  15  -live- %r0
  15  goto_if_not_ptr_iszero %r0, L1
  19  ref_return $<* struct pypy.interpreter.baseobjspace.W_Root>
  21  ---
  21  L1:
  21  ref_return %r0
