[SYCL][UR][L0] Add support for zeCommandListHostSynchronize

Instead of creating an event, appending it, and synchronizing on
it to wait for all commands in an immediate command list, emit a
zeCommandListHostSynchronize instead.

Signed-off-by: Jaime Arteaga <[email protected]>

Author: Jaime Arteaga

sycl/plugins/unified_runtime/ur/adapters/level_zero/queue.cpp

@@ -1358,18 +1358,8 @@ ur_result_t ur_queue_handle_t_::synchronize() {
     if (ImmCmdList == Queue->CommandListMap.end())
       return UR_RESULT_SUCCESS;
 
-    ur_event_handle_t Event{};
-    ur_result_t Res = createEventAndAssociateQueue(
-        reinterpret_cast<ur_queue_handle_t>(Queue), &Event,
-        UR_EXT_COMMAND_TYPE_USER, ImmCmdList, /* IsInternal */ false);
-    if (Res != UR_RESULT_SUCCESS)
-      return Res;
-    auto zeEvent = Event->ZeEvent;
-    ZE2UR_CALL(zeCommandListAppendBarrier,
-               (ImmCmdList->first, zeEvent, 0, nullptr));
-    ZE2UR_CALL(zeHostSynchronize, (zeEvent));
-    Event->Completed = true;
-    UR_CALL(urEventRelease(Event));
+    // wait for all commands previously submitted to this immediate command list
+    ZE2UR_CALL(zeCommandListHostSynchronize, (ImmCmdList->first, UINT64_MAX));
 
     // Cleanup all events from the synced command list.
     CleanupEventListFromResetCmdList(ImmCmdList->second.EventList, true);