[AOTI] Disable stack allocation when there is a fallback op (#122367)

Summary: Stack allocation is disabled when there is an aten fallback op, see https://github.com/pytorch/pytorch/blob/c84f81b395fff969bbd2f784efad8ab1a8aa52de/torch/_inductor/codegen/cpp_wrapper_cpu.py#L974. But we need to do the same where is a custom op fallback.

Test Plan: CI

Reviewed By: mikekgfb

Differential Revision: D55149369

Pull Request resolved: #122367
Approved by: https://github.com/mikekgfb

torch/_inductor/codegen/cpp_wrapper_cpu.py

@@ -1703,6 +1703,8 @@ def generate_extern_kernel_alloc_and_find_schema_if_needed(
         raw_args=None,
         outputs=None,
     ):
+        # No stack allocation when there is a fallback op
+        self.allow_stack_allocation = False
         if config.is_fbcode():
             assert op_overload is not None
             assert raw_args is not None