repl: name anonymous functions

the changes are related to https://github.com/nodejs/node/issues/8913
regarding the naming of just the inline anonymous
functions that are not assigned to a variable

PR-URL: https://github.com/nodejs/node/pull/9356


Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Roman Reiss <me@silverwind.io>