dirstate-item: use the properties in largefiles

I am now sure what large file is doing with then, but at least it is no longer
using the tuple API to access data.

Differential Revision: https://phab.mercurial-scm.org/D10990

hgext/largefiles/lfutil.py

@@ -546,7 +546,7 b' def synclfdirstate(repo, lfdirstate, lfi'
     lfstandin = standin(lfile)
     if lfstandin in repo.dirstate:
         stat = repo.dirstate._map[lfstandin]
-        state, mtime = stat[0], stat[3]
+        state, mtime = stat.state, stat.mtime
     else:
         state, mtime = b'?', -1
     if state == b'n':