Arm backend: Fix numerical accuracy error. (#13578)

A missing .graph caused numerical errors to show up as "AttributeError:
'GraphModule' object has no attribute 'output_node'"

Signed-off-by: Adrian Lundell <[email protected]>

Author: AdrianLundell

backends/arm/test/tester/analyze_output_utils.py

@@ -253,7 +253,7 @@ def dump_error_output(
     export_stage = tester.stages.get(StageType.EXPORT, None)
     quantize_stage = tester.stages.get(StageType.QUANTIZE, None)
     if export_stage is not None and quantize_stage is not None:
-        output_node = export_stage.artifact.graph_module.output_node()
+        output_node = export_stage.artifact.graph_module.graph.output_node()
         qp_input = get_input_quantization_params(export_stage.artifact)
         qp_output = get_output_quantization_params(output_node)
         logger.error(f"Input QuantArgs: {qp_input}")