lib: copy arguments object instead of leaking it

Instead of leaking the arguments object by passing it as an
argument to a function, copy it's contents to a new array,
then pass the array. This allows V8 to optimize the function
that contains this code, improving performance.

PR-URL: https://github.com/nodejs/node/pull/4361
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Brian White <mscdex@mscdex.net>

lib/console.js

@@ -85,7 +85,10 @@ Console.prototype.trace = function trace() {
 
 Console.prototype.assert = function(expression) {
   if (!expression) {
-    var arr = Array.prototype.slice.call(arguments, 1);
+    const argsLen = arguments.length || 1;
+    const arr = new Array(argsLen - 1);
+    for (var i = 1; i < argsLen; i++)
+      arr[i - 1] = arguments[i];
     require('assert').ok(false, util.format.apply(null, arr));
   }
 };