short circuit && and || evaluation. For backwards compat this is only

possible if there's no regex on the short circuited side (since it fills
in the backref data). The user may optimize this by putting the regex
onto the left side of the operator.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@101097 13f79535-47bb-0310-9956-ffa450edef68