On the fsx branch:  Merge the patches pertaining to the new
svn__priority_queue_* private API (r1460579,1462904,1467382 )
from /branches/fsfs-format7. There were no conflicts.

git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/fsx@1507859 13f79535-47bb-0310-9956-ffa450edef68