Martin von Zweigbergk <martinvonz@google.com> [Mon, 04 Feb 2019 21:00:58 -0800] rev 41598
largefiles: migrate to scmutil.backuppath()
It seems unnecessary to convert the paths here back to repo-relative
paths, but I'll leave that for someone else to clean up.
Differential Revision: https://phab.mercurial-scm.org/D5854