revlog: move nodemap update within the index code

Since the nodemap data now live in the index, it should be the index
responsibility to ensure the data are up to date.

This work is part of a refactoring to unify the revlog index and the nodemap.
This unification prepare the use of a persistent nodemap.

Differential Revision: https://phab.mercurial-scm.org/D7319

mercurial/pure/parsers.py

@@ -62,6 +62,8 b' class BaseIndexObject(object):'
         return self._lgt + len(self._extra)
 
     def append(self, tup):
+        if 'nodemap' in vars(self):
+            self.nodemap[tup[7]] = len(self)
         self._extra.append(tup)
 
     def _check_index(self, i):

mercurial/revlog.py

@@ -213,6 +213,10 b' class revlogoldindex(list):'
             nodemap[n] = r
         return nodemap
 
+    def append(self, tup):
+        self.nodemap[tup[7]] = len(self)
+        super(revlogoldindex, self).append(tup)
+
     def clearcaches(self):
         self.__dict__.pop('nodemap', None)
 
@@ -2189,7 +2193,6 b' class revlog(object):'
             node,
         )
         self.index.append(e)
-        self.nodemap[node] = curr
 
         # Reset the pure node cache start lookup offset to account for new
         # revision.