Merge r1833014 from trunk:

* modules/http/http_request.c (ap_process_request_after_handler,
  ap_process_request): Cache and retrieve the brigade structure used
  to send EOR and FLUSH between requests in c->pool userdata, to avoid
  allocating a brigade structure per-request out of c->pool.

Submitted by: rpluem, jorton

Submitted by: jorton
Reviewed by: jorton, covener, jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1833841 13f79535-47bb-0310-9956-ffa450edef68