Simpler and less space consuming implementation of svn_fs_node_created_rev in FSX.
Simpler and less space consuming implementation of svn_fs_node_created_rev
in FSX.

* subversion/libsvn_fs_x/dag.c
  (dag_node_t): Instead of an alternative ID, we simply store the result
                that svn_fs_node_created_rev will expect.
  (svn_fs_x__dag_get_node): Directly determine that revision number.
  (svn_fs_x__dag_get_revision): Simply return the value.

git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1653116 13f79535-47bb-0310-9956-ffa450edef68

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