Factor out two more functions in the merge code.
Factor out two more functions in the merge code.

* subversion/libsvn_client/merge.c
  (get_wc_subtree_explicit_mergeinfo): New function, factored out ...
  (get_mergeinfo_paths): ... of here ...
  (calculate_left_hand_side, merge_reintegrate_locked): ... and here.
  (merge_range_find_extremes): New function, factored out ...
  (remove_noop_merge_ranges, normalize_merge_sources_internal): ... of here.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1203985 13f79535-47bb-0310-9956-ffa450edef68

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