[SYCL][UR][L0] Use auto & to avoid copies on missing loops (#10023)

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

Author: Jaime Arteaga

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

@@ -271,7 +271,7 @@ UR_APIEXPORT ur_result_t UR_APICALL urEnqueueEventsWaitWithBarrier(
       if (Queue->Device->ImmCommandListUsed) {
         // If immediate command lists are being used, each will act as their own
         // queue, so we must insert a barrier into each.
-        for (auto ImmCmdList : QueueGroup.second.ImmCmdLists)
+        for (auto &ImmCmdList : QueueGroup.second.ImmCmdLists)
           if (ImmCmdList != Queue->CommandListMap.end())
             CmdLists.push_back(ImmCmdList);
       } else {

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

@@ -1390,7 +1390,7 @@ ur_result_t ur_queue_handle_t_::synchronize() {
       for (auto &QueueMap : {ComputeQueueGroupsByTID, CopyQueueGroupsByTID}) {
         for (auto &QueueGroup : QueueMap) {
           if (Device->ImmCommandListUsed) {
-            for (auto ImmCmdList : QueueGroup.second.ImmCmdLists) {
+            for (auto &ImmCmdList : QueueGroup.second.ImmCmdLists) {
               if (ImmCmdList == this->CommandListMap.end())
                 continue;
               // Cleanup all events from the synced command list.
@@ -1406,7 +1406,7 @@ ur_result_t ur_queue_handle_t_::synchronize() {
       for (auto &QueueMap : {ComputeQueueGroupsByTID, CopyQueueGroupsByTID}) {
         for (auto &QueueGroup : QueueMap) {
           if (Device->ImmCommandListUsed) {
-            for (auto ImmCmdList : QueueGroup.second.ImmCmdLists)
+            for (auto &ImmCmdList : QueueGroup.second.ImmCmdLists)
               syncImmCmdList(this, ImmCmdList);
           } else {
             for (auto &ZeQueue : QueueGroup.second.ZeQueues)