Make lazyindex load slightly faster

mercurial/revlog.py

@@ -77,12 +77,11 b' class lazyindex:'
         self.p = parser
     def __len__(self):
         return len(self.p.index)
-    def __getitem__(self, pos):
-        i = self.p.index[pos]
-        if not i:
+    def load(self, pos):
             self.p.load(pos)
             return self.p.index[pos]
-        return i
+    def __getitem__(self, pos):
+        return self.p.index[pos] or self.load(pos)
     def append(self, e):
         self.p.index.append(e)