message: Fix type of `backend` passed to `push_code_version`.
diff: @@ -862,7 +862,7 @@ fn execute_wasm(options: &Run) -> Result<(), String> {
  baseline: true,
  msm: msm,
  base: instance.module.runnable_module.get_code().unwrap().as_ptr() as usize,
  - backend: options.backend,
  + backend: options.backend.to_string().to_owned(),
  runnable_module: instance.module.runnable_module.clone(),
  });
  true
  