SWDEV-405329 - Fix cuMask issue for WGP mode

- Enable CUs adjacent pairwise for WGP mode
- In HostQueue::terminate() do not segfault if virtual device hasn't been created

Change-Id: I94402ff333308af5824878086cc238b3993d534d

rocclr/platform/commandqueue.cpp

@@ -60,11 +60,13 @@ HostQueue::HostQueue(Context& context, Device& device, cl_command_queue_properti
 
 bool HostQueue::terminate() {
   if (AMD_DIRECT_DISPATCH) {
-    Command* marker = new Marker(*this, true);
-    if (marker != nullptr) {
-      marker->enqueue();
-      marker->awaitCompletion();
-      marker->release();
+    if (vdev() != nullptr) {
+      Command* marker = new Marker(*this, true);
+      if (marker != nullptr) {
+        marker->enqueue();
+        marker->awaitCompletion();
+        marker->release();
+      }
     }
     thread_.Release();
     thread_.acceptingCommands_ = false;