8253224: Shenandoah: ShenandoahStrDedupQueue destructor calls virtual num_queues()

Reviewed-by: rkennke, zgu

Author: shipilev

src/hotspot/share/gc/shenandoah/shenandoahStrDedupQueue.cpp

@@ -50,7 +50,7 @@ ShenandoahStrDedupQueue::ShenandoahStrDedupQueue() :
 
 ShenandoahStrDedupQueue::~ShenandoahStrDedupQueue() {
   MonitorLocker ml(StringDedupQueue_lock, Mutex::_no_safepoint_check_flag);
-  for (size_t index = 0; index < num_queues(); index ++) {
+  for (size_t index = 0; index < num_queues_nv(); index ++) {
     release_buffers(queue_at(index));
   }
 

src/hotspot/share/gc/shenandoah/shenandoahStrDedupQueue.hpp

@@ -99,9 +99,11 @@ class ShenandoahStrDedupQueue : public StringDedupQueue {
   void verify_impl();
 
 protected:
-  size_t num_queues() const { return (_num_producer_queue + 2); }
+  size_t num_queues() const { return num_queues_nv(); }
 
 private:
+  inline size_t num_queues_nv() const { return (_num_producer_queue + 2); }
+
   ShenandoahQueueBuffer* new_buffer();
 
   void release_buffers(ShenandoahQueueBuffer* list);