core-debugobjects-2023-05-06

  The recent fix to ensure atomicity of lookup and allocation inadvertently
  broke the pool refill mechanism, so that debugobject OOMs now in certain
  situations. The reason is that the functions which got updated no longer
  invoke debug_objecs_init(), which is now the only place to care about
  refilling the tracking object pool.

  Restore the original behaviour by adding explicit refill opportunities to
  those places.