On the fsfs-format7 branch:  Since "trunk" is usually the one receiving
the most commits (even if it's only merges from other branches).

* subversion/libsvn_fs_fs/pack.c
  (compare_dir_entries_format7): being the now first in the list, "trunk"
   is now most likely to find all its data in one place and branches to
   diff against just this one place.

git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/fsfs-format7@1451169 13f79535-47bb-0310-9956-ffa450edef68