Re-implement svn_io_read_length_line as this is one of the most-called functions in SVN. Instead of reading data a byte at a time, read 128 byte chunks and scan those.
Re-implement svn_io_read_length_line as this is one of the
most-called functions in SVN. Instead of reading data a byte
at a time, read 128 byte chunks and scan those.

* subversion/libsvn_subr/io.c
  (svn_io_read_length_line): reimplement

git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1381800 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion