Follow-up to r34047, add a new merge test that demonstrates yet another merge bug.
Follow-up to r34047, add a new merge test that demonstrates yet another
merge bug.

* subversion/tests/cmdline/merge_tests.py
  (merge_range_prior_to_rename_source_existence):
  (test_list): Add XFailing merge_range_prior_to_rename_source_existence.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion