url: fix performance regression

PR-URL: nodejs#39778
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Gus Caplan <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>
Reviewed-By: Gerhard Stöbich <[email protected]>

lib/internal/url.js

@@ -617,7 +617,7 @@ function onParseHashComplete(flags, protocol, username, password,
 }
 
 function isURLThis(self) {
-  return self?.[context] !== undefined;
+  return (self !== undefined && self !== null && self[context] !== undefined);
 }
 
 class URL {