contrib: add heads(commonancestors(_)) to all-revsets
This is mainly to check that we don't regress our optimization path.
--- a/contrib/all-revsets.txt Tue Jun 26 15:26:21 2018 -0700
+++ b/contrib/all-revsets.txt Wed Jun 20 17:07:46 2018 -0700
@@ -135,3 +135,6 @@
# testing the mutable phases set
draft()
secret()
+
+# test finding common ancestors
+heads(commonancestors(46879 + ae7f))