=SOLR-4911, small efficiency improvement, thanks Yogi.

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1491454 13f79535-47bb-0310-9956-ffa450edef68
SOLR-4224: Refactor JavaBinCodec input stream definition to enhance reuse.

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1491459 13f79535-47bb-0310-9956-ffa450edef68