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>