Remove obsolete comment.

wasm/src/main/scala/org/scalajs/linker/backend/wasmemitter/ClassEmitter.scala

@@ -375,12 +375,6 @@ class ClassEmitter(coreSpec: CoreSpec) {
     *
     * The expression `isInstanceOf[<interface>]` will be compiled to a CALL to the function
     * generated by this method.
-    *
-    * TODO: Efficient type inclusion test. The current implementation generates a sparse array of
-    * itables, which, although O(1), may not be optimal for large interfaces. More compressed data
-    * structures could potentially improve performance in such cases.
-    *
-    * See https://github.com/tanishiking/scala-wasm/issues/27#issuecomment-2008252049
     */
   private def genInterfaceInstanceTest(clazz: LinkedClass)(implicit ctx: WasmContext): Unit = {
     assert(clazz.kind == ClassKind.Interface)