On the log-addressing branch:  Prepare the code for TXN format upgrades.

This patch adds an additional FINAL_REVISION parameter to all index
writer utilities such that the addressing mode can be determined on
independently from the revision the respective TXN was based upon.

* subversion/libsvn_fs_fs/transaction.c
  (store_l2p_index_entry,
   store_p2l_index_entry,
   allocate_item_index,
   write_hash_rep,
   write_hash_delta_rep): add FINAL_REVISION parameter
  (rep_write_contents_close,
   write_final_rev,
   write_final_changed_path_info): update callers

git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/log-addressing@1535674 13f79535-47bb-0310-9956-ffa450edef68