We can not use heap buckets for data that was allocated out of a pool.

We can not use heap buckets for data that was allocated out of a pool.
The basic problem is that when the pool is destroyed, the data will go
away unless it is in a pool bucket.  If it is in a pool bucket, then the
data will be copied into a heap bucket when the pool is destroyed.  This
becomes a real issue when we set some data off to the side to deal with
pipelined requests.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@86947 13f79535-47bb-0310-9956-ffa450edef68