Fix bogus-looking assertion.


git-svn-id: svn://svn.valgrind.org/vex/trunk@2885 8f6e269a-dfd6-0310-a8e1-e2731360e62c
Remove commented out junk which is never going to get used.
No functional change.


git-svn-id: svn://svn.valgrind.org/vex/trunk@2886 8f6e269a-dfd6-0310-a8e1-e2731360e62c