[Bugfix] SymIntArrayRef expected to contain concrete integers (#10170)

Signed-off-by: Bill Nell <bill@neuralmagic.com>

vllm/compilation/backends.py

@@ -329,6 +329,7 @@ class PiecewiseCompileInterpreter(torch.fx.Interpreter):
             self.fake_mode.from_tensor(t) if isinstance(t, torch.Tensor) else t
             for t in args
         ]
+        with self.fake_mode:
             return super().run(*fake_args)
 
     def call_module(self, target: torch.fx.node.Target,