LUCENE-5502: Fix TermsFilter.equals

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene_solr_4_7@1578523 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-5520: fix AIOOBE from ToChildBlockJoinQuery when a parent has no children

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene_solr_4_7@1578525 13f79535-47bb-0310-9956-ffa450edef68