Update coalesce filter to use heap buckets rather than pool buckets. This should fix the

mod_autoindex funky chunking behaviour until the ap_r* routines are reimplemented, at which
time this filter should probably go away.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@86943 13f79535-47bb-0310-9956-ffa450edef68