mixedrepostorecache: fix a silly redundant updating of set

Differential Revision: https://phab.mercurial-scm.org/D6470

mercurial/localrepo.py

@@ -128,7 +128,6 b' class mixedrepostorecache(_basefilecache'
         # scmutil.filecache only uses the path for passing back into our
         # join(), so we can safely pass a list of paths and locations
         super(mixedrepostorecache, self).__init__(*pathsandlocations)
-        for path, location in pathsandlocations:
             _cachedfiles.update(pathsandlocations)
 
     def join(self, obj, fnameandlocation):