perf: run 签名改 &Arc<CompiledModule>，顶层模块跨 run 共享——collect_flat_modules 顶层改 Arc::clone 消除逐 run 常量池深拷贝，全调用点 Arc 包装迁移

crates/oxide_test262/src/main.rs

@@ -695,7 +695,7 @@ fn run_test_inner(
     };
 
     let mut vm = Vm::with_kernel_core(Arc::clone(kernel));
-    let run_result = vm.run(&module);
+    let run_result = vm.run(&Arc::new(module));
     let dur = start.elapsed().as_millis() as u64;
 
     if is_async {