8267446: Taskqueue code fails with assert(bottom_relaxed() == age_top_relaxed()) failed: not empty

Reviewed-by: stefank, pliden

src/hotspot/share/gc/shared/taskTerminator.cpp

@@ -78,7 +78,6 @@ TaskTerminator::TaskTerminator(uint n_threads, TaskQueueSetSuper* queue_set) :
 TaskTerminator::~TaskTerminator() {
   if (_offered_termination != 0) {
     assert(_offered_termination == _n_threads, "Must be terminated or aborted");
-    assert_queue_set_empty();
   }
 
   assert(_spin_master == NULL, "Should have been reset");

src/hotspot/share/gc/shared/taskqueue.hpp

@@ -465,6 +465,8 @@ public:
   GenericTaskQueueSet(uint n);
   ~GenericTaskQueueSet();
 
+  // Set the i'th queue to the provided queue.
+  // Does not transfer ownership of the queue to this queue set.
   void register_queue(uint i, T* q);
 
   T* queue(uint n);