SWDEV-301667 - StreamwaitEvent may not flush caches

Change-Id: I8d648f96273b36d4930216ffa05bf1adb3c408da

hipamd/src/hip_event.cpp

@@ -183,6 +183,9 @@ hipError_t Event::streamWaitCommand(amd::Command*& command, hip::Stream* stream)
     eventWaitList.push_back(event_);
   }
   command = new amd::Marker(*stream, kMarkerDisableFlush, eventWaitList);
+  // Since we only need to have a dependency on an existing event,
+  // we may not need to flush any caches.
+  command->setEventScope(amd::Device::kCacheStateIgnore);
 
   if (command == NULL) {
     return hipErrorOutOfMemory;