On the revprop-caching-ng branch:  Improved crash recovery efficiency.

* subversion/libsvn_fs_fs/revprops.c
  (read_revprop_generation):  If the writer process is to discover another
                              crashed writer, we can recover immediately.

git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/revprop-caching-ng@1620242 13f79535-47bb-0310-9956-ffa450edef68