Return gm.forward for eager backend (#124109)

Summary:
X-link: pytorch/pytorch#124109
Approved by: https://github.com/yanboliang, https://github.com/jansel
ghstack dependencies: #124445

Reviewed By: jeanschmidt

Differential Revision: D56408649

Pulled By: anijain2305

fbshipit-source-id: c15bd1c2034bb6e01bc9a909f91021702579e779

Author: anijain2305

userbenchmark/dynamo/dynamobench/_dynamo/testing.py

@@ -208,7 +208,7 @@ def __init__(self):
 
     def __call__(self, gm: torch.fx.GraphModule, example_inputs: List[torch.Tensor]):
         self.graphs.append(gm)
-        return gm
+        return gm.forward
 
 
 def strip_comment(code) -> str: