Correct queue error reporting.

VM faults should not report via the queue error handler.
The system event contains much more useful information.

Change-Id: I744d9b97b23334d7ed2c0f450111c1b8032567e3

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

@@ -1042,6 +1042,13 @@ bool AqlQueue::ExceptionHandler(hsa_signal_value_t error_code, void* arg) {
   // Undefined or unexpected code
   assert((errorCode != HSA_STATUS_ERROR) && "Undefined or unexpected queue error code");
 
+  // Suppress VM fault reporting.  This is more useful when reported through the system error
+  // handler.
+  if (errorCode == HSA_STATUS_ERROR_MEMORY_FAULT) {
+    debug_print("Queue error - HSA_STATUS_ERROR_MEMORY_FAULT\n");
+    return false;
+  }
+
   queue->Suspend();
   if (queue->errors_callback_ != nullptr) {
     queue->errors_callback_(errorCode, queue->public_handle(), queue->errors_data_);