fixup! Mark OpaqueWrappable specializations as final

Author: jasnell

src/workerd/jsg/promise.h

@@ -25,7 +25,9 @@ namespace workerd::jsg {
 template <typename T, bool = isGcVisitable<T>()>
 struct OpaqueWrappable;
 
-struct OpaqueWrappableBase: public Wrappable {
+#define DEFAULT_VISIBILITY __attribute__((visibility("default")))
+
+struct DEFAULT_VISIBILITY OpaqueWrappableBase: public Wrappable {
   kj::StringPtr jsgGetMemoryName() const override final {
     return "OpaqueWrappable"_kjc;
   }
@@ -40,7 +42,7 @@ struct OpaqueWrappableBase: public Wrappable {
 // values.
 
 template <typename T>
-struct OpaqueWrappable<T, false> final: public OpaqueWrappableBase {
+struct DEFAULT_VISIBILITY OpaqueWrappable<T, false> final: public OpaqueWrappableBase {
   // Used to implement wrapOpaque().
 
   OpaqueWrappable(T&& value): value(kj::mv(value)) {}
@@ -54,7 +56,7 @@ struct OpaqueWrappable<T, false> final: public OpaqueWrappableBase {
 };
 
 template <typename T>
-struct OpaqueWrappable<T, true> final: public OpaqueWrappableBase {
+struct DEFAULT_VISIBILITY OpaqueWrappable<T, true> final: public OpaqueWrappableBase {
   // When T is GC-visitable, make sure to implement visitation.
 
   OpaqueWrappable(T&& value): value(kj::mv(value)) {}