Rune - Fix livelock on heavily contended locks

Rune - Fix livelock on heavily contended locks

* Fix a livelock on heavily contended locks.  When waking up a list
  of blocked threads, a livelock situation can develop where the threads
  are placed back on the list asynchronously, preventing the iterator
  from ever being able to finish scanning the list.

* Fixed by issuing the wakeup in two passes.  The first pass moves td's
  to be woken up out of the list and onto a safe list.  The second pass
  wakes the tds up via the save list.

* Also fix Declaration layout (@rune_decl...), we added two fields.