LUCENE-4948: Fix stinkbug in PostingsHighlighter (wrong array sizing on some jvms)

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene_solr_4_3@1483258 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-4953: Fixed ParallelCompositeReader to inform ReaderClosedListeners of its synthetic subreaders. FieldCaches keyed on the atomic childs will be purged earlier and FC insanity prevented.  In addition, ParallelCompositeReader's toString() was changed to better reflect the reader structure.

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene_solr_4_3@1483272 13f79535-47bb-0310-9956-ffa450edef68