Following up on r1539327 extract the depth skip handling to a different function.

* subversion/libsvn_wc/wc_db_update_move.c
  (check_bump_layer): New function, extracted from...
  (bump_moved_layer): .. this function that now only gets called after
    the depth has been processed.
  (bump_moved_away): Call check_bump_layer directly.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1539338 13f79535-47bb-0310-9956-ffa450edef68