message: [onnxifi] Make sure that backend handles run async.
diff: @@ -303,10 +303,10 @@ class ONNXCppDriverTest : public ::testing::TestWithParam<
  lib.onnxInitEvent(backend, &inputFence.event), &graph, lib));
  ASSERT_TRUE(IsGtestAssertMemorySafeSuccess(
  lib.onnxInitEvent(backend, &outputFence.event), &graph, lib));
  - ASSERT_TRUE(IsGtestAssertMemorySafeSuccess(
  - lib.onnxSignalEvent(inputFence.event), &graph, lib));
  ASSERT_TRUE(IsGtestAssertMemorySafeSuccess(
  lib.onnxRunGraph(graph, &inputFence, &outputFence), &graph, lib));
  + ASSERT_TRUE(IsGtestAssertMemorySafeSuccess(
  + lib.onnxSignalEvent(inputFence.event), &graph, lib));
  ASSERT_TRUE(IsGtestAssertMemorySafeSuccess(
  lib.onnxWaitEvent(outputFence.event), &graph, lib));
  lib.onnxReleaseEvent(outputFence.event);
  