revert: bring back usage of `subset & ps` in `parents` Changeset 95af98616aa7 switched the order of the operand of the "&" computation to work around an issue from repo-wide spanset. The need for a workaround has been alleviated by the introduction of `fullreposet`. So we restore it to normal. The benchmark shows no significant changes as expected. We also revert the bogus test change introduced by 95af98616aa7. The order is actually important.

--- a/tests/test-revset.t	Sun Aug 24 17:40:27 2014 -0400
+++ b/tests/test-revset.t	Wed Sep 17 04:55:55 2014 -0700
@@ -567,10 +567,10 @@
 test intersecting something with an addset
 
   $ log 'parents(outgoing() or removes(a))'
-  8
   1
   4
   5
+  8
 
 check that conversion to only works
   $ try --optimize '::3 - ::1'