wp-config-host-fix.php

<?php
# add to your wp-config.php, ANYWHERE before "require_once(ABSPATH . 'wp-settings.php');" line

# you can drop the :8080 if you serve it on the regular port
# change <your.old.domain.com> to your domain you wish to replace
define('WP_HOME', 'http://localhost:8080');
define('WP_SITEURL', 'http://localhost:8080');
function _fix_siteurl_in_html( $buf = '' ) {
  $buf = str_replace( 'http://<your.old.domain.com>/', WP_SITEURL . '/', $buf );
  return $buf;
}
ob_start('_fix_siteurl_in_html');