jspi: Handle change to the type reflection API. (#20401)

Author: brendandahl

src/library_async.js

@@ -458,7 +458,8 @@ addToLibrary({
 #if ASYNCIFY_DEBUG
       dbg('asyncify: returnPromiseOnSuspend for', original);
 #endif
-      var type = WebAssembly.Function.type(original);
+      // TODO: remove `WebAssembly.Function.type` call when the new API is ready on all the testers.
+      var type = original.type ? original.type() : WebAssembly.Function.type(original);
       var parameters = type.parameters;
       var results = type.results;
 #if ASSERTIONS