   0  getfield_gc_r %r0, FieldDescr<pypy.module.zlib.interp_zlib.ZLibObject.inst__lock> -> %r1
   5  getfield_gc_i_pure %r1, FieldDescr<rpython.rlib.rthread.Lock.inst__lock> -> %i0
  10  residual_call_ir_i $<* fn RPyThreadReleaseLock>, I[%i0], R[], <CallDescr(i) EF=2> -> %i0
  18  -live- %i0, %r0
  21  goto_if_not_int_is_true %i0, L1
  25  raise $<* struct object>
  27  ---
  27  L1:
  27  -live- %r0
  30  void_return
