http: name anonymous function in _http_common.js

Refs: https://github.com/nodejs/node/issues/8913

PR-URL: https://github.com/nodejs/node/pull/21755
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Jon Moss <me@jonathanmoss.me>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

lib/_http_common.js

@@ -148,7 +148,7 @@ function parserOnMessageComplete() {
 }
 
 
-const parsers = new FreeList('parsers', 1000, function() {
+const parsers = new FreeList('parsers', 1000, function parsersCb() {
   const parser = new HTTPParser(HTTPParser.REQUEST);
 
   parser._headers = [];