net: fix permanent deoptimizations

PR-URL: https://github.com/nodejs/node/pull/12456
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

lib/net.js

@@ -81,15 +81,15 @@ function createServer(options, connectionListener) {
 // connect(path, [cb]);
 //
 function connect() {
-  const args = new Array(arguments.length);
+  var args = new Array(arguments.length);
   for (var i = 0; i < arguments.length; i++)
     args[i] = arguments[i];
   // TODO(joyeecheung): use destructuring when V8 is fast enough
-  const normalized = normalizeArgs(args);
-  const options = normalized[0];
-  const cb = normalized[1];
+  var normalized = normalizeArgs(args);
+  var options = normalized[0];
+  var cb = normalized[1];
   debug('createConnection', normalized);
-  const socket = new Socket(options);
+  var socket = new Socket(options);
 
   if (options.timeout) {
     socket.setTimeout(options.timeout);
@@ -915,13 +915,13 @@ function internalConnect(
 
 
 Socket.prototype.connect = function() {
-  const args = new Array(arguments.length);
+  var args = new Array(arguments.length);
   for (var i = 0; i < arguments.length; i++)
     args[i] = arguments[i];
   // TODO(joyeecheung): use destructuring when V8 is fast enough
-  const normalized = normalizeArgs(args);
-  const options = normalized[0];
-  const cb = normalized[1];
+  var normalized = normalizeArgs(args);
+  var options = normalized[0];
+  var cb = normalized[1];
   return realConnect.call(this, options, cb);
 };
 
@@ -1373,19 +1373,19 @@ function listenInCluster(server, address, port, addressType,
 
 
 Server.prototype.listen = function() {
-  const args = new Array(arguments.length);
+  var args = new Array(arguments.length);
   for (var i = 0; i < arguments.length; i++)
     args[i] = arguments[i];
   // TODO(joyeecheung): use destructuring when V8 is fast enough
-  const normalized = normalizeArgs(args);
+  var normalized = normalizeArgs(args);
   var options = normalized[0];
-  const cb = normalized[1];
+  var cb = normalized[1];
 
   var hasCallback = (cb !== null);
   if (hasCallback) {
     this.once('listening', cb);
   }
-  const backlogFromArgs =
+  var backlogFromArgs =
     // (handle, backlog) or (path, backlog) or (port, backlog)
     toNumber(args.length > 1 && args[1]) ||
     toNumber(args.length > 2 && args[2]);  // (port, host, backlog)
@@ -1414,11 +1414,12 @@ Server.prototype.listen = function() {
   // ([port][, host][, backlog][, cb]) where port is specified
   // or (options[, cb]) where options.port is specified
   // or if options.port is normalized as 0 before
+  var backlog;
   if (typeof options.port === 'number' || typeof options.port === 'string') {
     if (!isLegalPort(options.port)) {
       throw new RangeError('"port" argument must be >= 0 and < 65536');
     }
-    const backlog = options.backlog || backlogFromArgs;
+    backlog = options.backlog || backlogFromArgs;
     // start TCP server listening on host:port
     if (options.host) {
       lookupAndListen(this, options.port | 0, options.host, backlog,
@@ -1434,8 +1435,8 @@ Server.prototype.listen = function() {
   // (path[, backlog][, cb]) or (options[, cb])
   // where path or options.path is a UNIX domain socket or Windows pipe
   if (options.path && isPipeName(options.path)) {
-    const pipeName = this._pipeName = options.path;
-    const backlog = options.backlog || backlogFromArgs;
+    var pipeName = this._pipeName = options.path;
+    backlog = options.backlog || backlogFromArgs;
     listenInCluster(this, pipeName, -1, -1,
                     backlog, undefined, options.exclusive);
     return this;