dirstate-item: use the properties in `contrib/dirstatenonnormalcheck.py`

Differential Revision: https://phab.mercurial-scm.org/D10991

contrib/dirstatenonnormalcheck.py

@@ -18,7 +18,7 b' def nonnormalentries(dmap):'
     """Compute nonnormal entries from dirstate's dmap"""
     res = set()
     for f, e in dmap.iteritems():
-        if e[0] != b'n' or e[3] == -1:
+        if e.state != b'n' or e.mtime == -1:
             res.add(f)
     return res