SOLR-5210: make perSegFilter cache actually per-segment
SOLR-5210: make perSegFilter cache actually per-segment

git-svn-id: 308d55f399f3bd9aa0560a10e81a003040006c48@1521559 13f79535-47bb-0310-9956-ffa450edef68

cscorley/solr-only-mirror,cscorley/solr-only-mirror,cscorley/solr-only-mirror