Use guard_manager consistently instead of check_fn (#138896)

Summary:
X-link: pytorch/pytorch#138896
Approved by: https://github.com/williamwen42, https://github.com/jansel
ghstack dependencies: #138512

Reviewed By: wdvr

Differential Revision: D65030963

Pulled By: anijain2305

fbshipit-source-id: 7423473e4c3613aea42e13a64eae9c417c876964

userbenchmark/dynamo/dynamobench/_dynamo/testing.py

@@ -191,7 +191,7 @@ def insert_nops(instructions: List[Any], code_options: Any) -> None:
         torch_function_mode_stack=[],
     )
 
-    return GuardedCode(code, CheckFunctionManager(graph).check_fn, CompileId(0, 0))
+    return GuardedCode(code, CheckFunctionManager(graph).guard_manager, CompileId(0, 0))  # type: ignore[arg-type]
 
 
 class CompileCounter: