~ThreadBlockInVM() {

  {- -------------------------------------------
  (1) ThreadStateTransition::trans_and_fence() を呼んで, JavaThreadState を _thread_in_vm に変更する.
      ---------------------------------------- -}

        trans_and_fence(_thread_blocked, _thread_in_vm);
        // We don't need to clear_walkable because it will happen automagically when we return to java
      }