Support FX Legacy registry name; use constants for registry names

Author: laikhtewari

py/torch_tensorrt/dynamo/tools/opset_coverage.py

@@ -48,6 +48,10 @@ class OpsetCoverage:
     Path(os.path.dirname(torchgen.__file__)) / "packaged/ATen/native/tags.yaml"
 )
 
+DYNAMO_REGISTRY_NAME = "Dynamo ATen Converters Registry"
+FX_REGISTRY_NAME = "FX ATen Converters Registry"
+FX_LEGACY_REGISTRY_NAME = "FX Legacy ATen Converters Registry"
+
 
 def get_aten_ops() -> List[Tuple[str, str]]:
     parsed_yaml = parse_native_yaml(NATIVE_FUNCTION_YAML_PATH, TAGS_YAML_PATH)
@@ -140,11 +144,12 @@ def opset_coverage(
             _, registry_data = c_registry.get_all_converters_with_target(
                 target, return_registry_info=True
             )
+
             if registry_data is not None:
-                if registry_data["Dynamo ATen Converters Registry"] >= 1:
+                if DYNAMO_REGISTRY_NAME in registry_data and registry_data[DYNAMO_REGISTRY_NAME] >= 1:
                     status = SupportStatus.CONVERTED
                     support_count += 1
-                elif registry_data["FX ATen Converters Registry"] >= 1:
+                elif (FX_REGISTRY_NAME in registry_data and registry_data[FX_REGISTRY_NAME] >= 1) or (FX_LEGACY_REGISTRY_NAME in registry_data and registry_data[FX_LEGACY_REGISTRY_NAME] >= 1):
                     status = SupportStatus.LEGACY_CONVERTED
                     legacy_count += 1