worker: copy transferList ArrayBuffers on unknown allocator

If the `ArrayBuffer::Allocator` used to create `ArrayBuffer`s
in the current `Isolate` is not a Node.js `ArrayBufferAllocator`,
we cannot know that it is `malloc()`-based, an in particular it might
not be compatible with the `ArrayBuffer::Allocator` on the receiving
end of the connection.

PR-URL: nodejs/node#26207
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Joyee Cheung <[email protected]>

Author: addaleax

src/node_messaging.cc

@@ -279,7 +279,8 @@ Maybe<bool> Message::Serialize(Environment* env,
         Local<ArrayBuffer> ab = entry.As<ArrayBuffer>();
         // If we cannot render the ArrayBuffer unusable in this Isolate and
         // take ownership of its memory, copying the buffer will have to do.
-        if (!ab->IsNeuterable() || ab->IsExternal())
+        if (!ab->IsNeuterable() || ab->IsExternal() ||
+            !env->isolate_data()->uses_node_allocator()) {
           continue;
         }
         // We simply use the array index in the `array_buffers` list as the