Use Arc instead of Rc

lib/runtime-core/src/module.rs

@@ -19,14 +19,12 @@ use crate::backend::CacheGen;
 use indexmap::IndexMap;
 use std::collections::HashMap;
 use std::sync::Arc;
-use std::{cell::RefCell, rc::Rc};
 
 /// This is used to instantiate a new WebAssembly module.
 #[doc(hidden)]
 pub struct ModuleInner {
-    pub runnable_module: Rc<RefCell<Box<dyn RunnableModule>>>,
+    pub runnable_module: Arc<Box<dyn RunnableModule>>,
     pub cache_gen: Box<dyn CacheGen>,
-
     pub info: ModuleInfo,
 }