revlog: use pycompat.maplist to eagerly evaluate map on Python 3

According to Pulkit, this should fix `hg status --all` on Python 3.

mercurial/revlog.py

@@ -33,6 +33,7 b' from . import ('
     error,
     mdiff,
     parsers,
+    pycompat,
     templatefilters,
     util,
 )
@@ -943,7 +944,7 b' class revlog(object):'
             ancs = self.index.commonancestorsheads(a, b)
         except (AttributeError, OverflowError): # C implementation failed
             ancs = ancestor.commonancestorsheads(self.parentrevs, a, b)
-        return map(self.node, ancs)
+        return pycompat.maplist(self.node, ancs)
 
     def isancestor(self, a, b):
         """return True if node a is an ancestor of node b