Support async. queue errors and dynamic scratch without KFD events.

Change-Id: I4e9e7a37aa7b9c96b28ce79f562760283e02b1e0

runtime/hsa-runtime/core/runtime/runtime.cpp

@@ -552,7 +552,7 @@ hsa_status_t Runtime::SetAsyncSignalHandler(hsa_signal_t signal,
                                             hsa_amd_signal_handler handler,
                                             void* arg) {
   // Asyncronous signal handler is only supported when KFD events are on.
-  if (!core::g_use_interrupt_wait) return HSA_STATUS_ERROR_OUT_OF_RESOURCES;
+  // if (!core::g_use_interrupt_wait) return HSA_STATUS_ERROR_OUT_OF_RESOURCES;
 
   // Indicate that this signal is in use.
   if (signal.handle != 0) hsa_signal_handle(signal)->Retain();