Tweak the fix to not use helpers but let resolve restore the old version.
* bzrlib/merge.py:
(Merge3Merger._merge_names): Don't create helpers as it may
conflict with a related 'contents conflit'.
* bzrlib/conflicts.py:
(PathConflict.associated_filenames): No more helpers.
(PathConflict._resolve): Restore the item if needed (based on the
paths involved).