Code review comment for lp:~abentley/bzr/fix_get_mtime

measuring this would be good.... but I suspect there are too many confounding factors to get accurate results today. At least for dirstate trees it can avoid building a fileid<->path mapping, so I would be a lot happier if this passed the right path in, rather than not passing it in. Tree transform should know that the rename has occured and be able to determine this easily.