[inductor][invoke_subgraph] Free the buffers before the subgraph call (pytorch#152494)

Before
![image](https://github.com/user-attachments/assets/62b24c14-69e6-40fb-94e3-223930132ef6)

After
![image](https://github.com/user-attachments/assets/9f340d4e-80a9-45aa-9400-626fff5b5ecd)

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Pull Request resolved: pytorch#152494
Approved by: https://github.com/Skylion007, https://github.com/eellison

Author: anijain2305

torch/_inductor/codegen/wrapper.py

@@ -2928,6 +2928,10 @@ def codegen_subgraph_call(self, subgraph, outer_inputs, outer_buffer_name):
 
         self.writeline(f"{subgraph.graph.name}_args = [{outer_input_names}]")
 
+        # Since the buffers are already put into the args list, we can free the
+        # buffers here.
+        V.graph.scheduler.free_buffers()
+
         # Call the subgraph launcher function
         self.writeline(
             f"{outer_buffer_name} = {subgraph.graph.name}({subgraph.graph.name}_args)"