SOLR-4224: Refactor JavaBinCodec input stream definition to enhance reuse.

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1491461 13f79535-47bb-0310-9956-ffa450edef68
=SOLR-4911, small efficiency improvement, thanks Yogi.

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1491471 13f79535-47bb-0310-9956-ffa450edef68