SOLR-5618: Fix false cache hits in queryResultCache when hashCodes are equal and duplicate filter queries exist in one of the requests (merge r1556988)

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene_solr_4_6@1557008 13f79535-47bb-0310-9956-ffa450edef68