Introduce optimized readline() for streams that support efficient, 
pseudo-random access to their content.

Merged revisions from /branches/performance:
985601, 985695, 1029054, 1029063

git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/integrate-readline-speedup@1072553 13f79535-47bb-0310-9956-ffa450edef68
1 file changed