Lift a constant function result out of several loops.
Lift a constant function result out of several loops.

* subversion/libsvn_fs_fs/tree.c
  (merge):
    Instead of calling svn_fs_fs__fs_supports_mergeinfo(fs) many
    times, save it's result and use that throughout the function.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1325616 13f79535-47bb-0310-9956-ffa450edef68

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