fix: for pooled memory used for reference types, clear it on return to the pool so that it doesn't prevent GC of the instances it contained (#6937)

src/Ryujinx.HLE/HOS/Kernel/Threading/KSynchronization.cs

@@ -104,7 +104,7 @@ namespace Ryujinx.HLE.HOS.Kernel.Threading
                     }
                 }
 
-                ArrayPool<LinkedListNode<KThread>>.Shared.Return(syncNodesArray);
+                ArrayPool<LinkedListNode<KThread>>.Shared.Return(syncNodesArray, true);
             }
 
             _context.CriticalSection.Leave();