Add an iterpool when migrating tree conflict data from f12 to f13.
Add an iterpool when migrating tree conflict data from f12 to f13.

* subversion/libsvn_wc/upgrade.c
  (migrate_single_tree_conflict_data): Add the iteration pool.

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