SWDEV-335780 - Indicate if handler is queued

Maintain status of handler callback. For event records we no longer
submit callbacks to reduce the load on the async handler thread. However
without a callback we leak command memory/decrement refcounts. Indicate
status of the handler which we can use to queue a callback when
finish is called.

Change-Id: I89fd02f3d047a0e8162664ee17581a14795f1928

rocclr/platform/commandqueue.cpp

@@ -114,8 +114,7 @@ void HostQueue::finish() {
       return;
     }
   }
-
-  if (nullptr == command || !isCacheFlushed) {
+  if (nullptr == command || !isCacheFlushed || vdev()->isHandlerPending()) {
     if (nullptr != command) {
       command->release();
     }