[wasm] Use a Managed<WasmModule> to hold metadata about modules.

src/snapshot/code-serializer.h

Index: src/snapshot/code-serializer.h
diff --git a/src/snapshot/code-serializer.h b/src/snapshot/code-serializer.h
index 7d78bdccdbf1c07f1bfb118944b8e6fc3c9f8b17..61780ec0f860dc17bc1b76b96fb255c82917cebd 100644
--- a/src/snapshot/code-serializer.h
+++ b/src/snapshot/code-serializer.h
@@ -74,7 +74,9 @@ class WasmCompiledModuleSerializer : public CodeSerializer {
     }
   }
 
-  bool ElideObject(Object* obj) override { return obj->IsWeakCell(); };
+  bool ElideObject(Object* obj) override {
+    return obj->IsWeakCell() || obj->IsForeign();
+  };
 
  private:
   WasmCompiledModuleSerializer(Isolate* isolate, uint32_t source_hash)