SWDEV-518831 - fix streams' sync issue in mthreads (#123)

* SWDEV-518831 - fix streams' sync issue in mthreads

1. Fix sync issue of null stream and non-null streams in
multithreads.
2. Remove assert(GetSubmissionBatch() == nullptr) as it
is invalid in multithreads.
3. Update getActiveQueues() to deal with the state of 
being terminated.

rocclr/device/device.cpp

@@ -1107,6 +1107,21 @@ void Device::IpcDetach(void* dev_ptr) const {
   }
 }
 
+std::vector<amd::CommandQueue*> Device::getActiveQueues() {
+  amd::ScopedLock lock(activeQueuesLock_);
+  for (auto it = activeQueues.begin(); it != activeQueues.end();) {
+    if ((*it)->referenceCount() == 0) {
+      // It is being terminated in HostQueue::terminate().
+      // We should not wait for commands in a queue being terminated.
+      it = activeQueues.erase(it);
+    } else {
+      // In case the queue will be destroyed in Stream::Destroy().
+      (*it)->retain();
+      ++it;
+    }
+  }
+  return std::vector<amd::CommandQueue*>(activeQueues.begin(), activeQueues.end());
+}
 }  // namespace amd
 
 namespace amd::device {