Arm backend: Normalize enum signatures in API manifest (pytorch#19361)

Normalize Enum subclass signatures in the Arm public API manifest
generator so the output stays stable across Python versions.

Use a fixed `(*values)` signature for enum entries instead of relying on
`inspect.signature()` for `EnumMeta.__call__`, and update the checked-in
manifest snapshot to match.

Signed-off-by: Sebastian Larsson <sebastian.larsson@arm.com>

Author: Sebastian-Larsson

backends/arm/public_api_manifests/api_manifest_running.toml

@@ -22,7 +22,7 @@ signature = "EthosUCompileSpec(target: str, system_config: str | None = None, me
 
 [python.EthosUCompileSpec.DebugMode]
 kind = "enum"
-signature = "EthosUCompileSpec.DebugMode(value, names=None, *, module=None, qualname=None, type=None, start=1)"
+signature = "EthosUCompileSpec.DebugMode(*values)"
 
 [python.EthosUCompileSpec.__eq__]
 kind = "function"
@@ -106,7 +106,7 @@ signature = "VgfCompileSpec(tosa_spec: executorch.backends.arm.tosa.specificatio
 
 [python.VgfCompileSpec.DebugMode]
 kind = "enum"
-signature = "VgfCompileSpec.DebugMode(value, names=None, *, module=None, qualname=None, type=None, start=1)"
+signature = "VgfCompileSpec.DebugMode(*values)"
 
 [python.VgfCompileSpec.__eq__]
 kind = "function"

backends/arm/scripts/generate_public_api_manifest.py

@@ -60,6 +60,9 @@ def _api_kind(obj: object) -> str:
 
 
 def _api_signature(path: str, obj: object) -> str:
+    if inspect.isclass(obj) and issubclass(obj, enum.Enum):
+        # EnumMeta.__call__ renders differently across Python versions.
+        return f"{path}(*values)"
     try:
         return f"{path}{inspect.signature(cast(Any, obj))}"
     except (TypeError, ValueError):