phase: also overwrite phase's sets when replacing a phasecache

We need to copy this new attributes around too. This fix an issue where phases
data used by 'not public()' were not invalidated properly.

mercurial/phases.py

@@ -171,7 +171,7 b' class phasecache(object):'
         return ph
 
     def replace(self, phcache):
-        for a in 'phaseroots dirty opener _phaserevs'.split():
+        for a in 'phaseroots dirty opener _phaserevs _phasesets'.split():
             setattr(self, a, getattr(phcache, a))
 
     def _getphaserevsnative(self, repo):