Cherry-pick "Refactor Regexp.prototype" am: 780b5e3420 am: fd88a6d57e am: 40be1f0a48 am: 8419031c72 am: 3157132735 am: 96c75dc8d8 am: e8640cee53

Change-Id: Ic54be21c8d4ea273cfb79822a1cce1d0e6d39444