On the fs-rep-sharing branch: Handle the simple case of shared reps.  This does NOT handle these cases:  * Two files in the same revision with the same contents.  * Two files in parallel commits with the same contents.
On the fs-rep-sharing branch:
Handle the simple case of shared reps.  This does NOT handle these cases:
 * Two files in the same revision with the same contents.
 * Two files in parallel commits with the same contents.

* subversion/libsvn_fs_fs/fs_fs.c
  (REP_REFERENCE): Remove.
  (rep_write_contents_close): Check for an existing rep with the same checksum
    as the just-closed rep.  If one exists, remove the just-written rep.


git-svn-id: b8cc343a69b1f0cbd825b978e2a42c89704f90e3@873481 13f79535-47bb-0310-9956-ffa450edef68

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