8286628: Remove unused BufferNode::Allocator::flush_free_list

Reviewed-by: kbarrett, tschatzl

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

@@ -194,10 +194,6 @@ public:
   size_t free_count() const;
   BufferNode* allocate();
   void release(BufferNode* node);
-
-  // If _free_list has items buffered in the pending list, transfer
-  // these to make them available for re-allocation.
-  bool flush_free_list() { return _free_list.try_transfer_pending(); }
 };
 
 // A PtrQueueSet represents resources common to a set of pointer queues.

test/hotspot/gtest/gc/shared/test_ptrQueueBufferAllocator.cpp

@@ -38,7 +38,7 @@
 class BufferNode::TestSupport : AllStatic {
 public:
   static bool try_transfer_pending(Allocator* allocator) {
-    return allocator->flush_free_list();
+    return allocator->_free_list.try_transfer_pending();
   }
 
   class CompletedList;