[NFC][SYCL] Minor perf fixes after #18767 (#18964)

Issues identification/suggested fixes by @Alexandr-Konovalov.

This doesn't fix everything, but let's merge what we're sure about
already.

Author: aelovikov-intel

sycl/source/detail/event_impl.cpp

@@ -192,7 +192,7 @@ event_impl::event_impl(const QueueImplPtr &Queue)
 }
 
 void event_impl::setQueue(queue_impl &Queue) {
-  MQueue = Queue.shared_from_this();
+  MQueue = Queue.weak_from_this();
   MIsProfilingEnabled = Queue.MIsProfilingEnabled;
 
   // TODO After setting the queue, the event is no longer default
@@ -202,9 +202,9 @@ void event_impl::setQueue(queue_impl &Queue) {
 }
 
 void event_impl::setSubmittedQueue(std::weak_ptr<queue_impl> SubmittedQueue) {
-  MSubmittedQueue = SubmittedQueue;
+  MSubmittedQueue = std::move(SubmittedQueue);
   if (MHostProfilingInfo) {
-    if (auto QueuePtr = SubmittedQueue.lock()) {
+    if (auto QueuePtr = MSubmittedQueue.lock()) {
       device_impl &Device = QueuePtr->getDeviceImpl();
       MHostProfilingInfo->setDevice(&Device);
     }

sycl/source/detail/event_impl.hpp

@@ -235,7 +235,7 @@ class event_impl {
   ///
   /// @return
   void setWorkerQueue(std::weak_ptr<queue_impl> WorkerQueue) {
-    MWorkerQueue = WorkerQueue;
+    MWorkerQueue = std::move(WorkerQueue);
   };
 
   /// Sets original queue used for submission.