Jump label reworked

The jump label work is in the queue for .40 so do not expect to see this change in any of the .39-rc releases. After several rounds of review, we finally got something everyone was in agreement with, but this happened just before the merge window opened. As we have not had time to get the changes into linux-next (due to the constant churn of updating due to minor change suggestions by reviewers), that we decided to hold off a full release cycle.