dirstatemap: move `_refresh_entry` out of the common methods

This is only used in the Python implementation now

Differential Revision: https://phab.mercurial-scm.org/D12515

mercurial/dirstatemap.py

@@ -98,9 +98,6 b' class _dirstatemapcommon:'
         tracking in a different way.
         """
 
-    def _refresh_entry(self, f, entry):
-        """record updated state of an entry"""
-
     ### disk interaction
 
     def _opendirstatefile(self):
@@ -523,6 +520,7 b' class dirstatemap(_dirstatemapcommon):'
         self._refresh_entry(filename, entry)
 
     def _refresh_entry(self, f, entry):
+        """record updated state of an entry"""
         if not entry.any_tracked:
             self._map.pop(f, None)