PR24812: support order-parametrized begin/end probes

PR24812: support order-parametrized begin/end probes

It was found that begin probes were already order parameterized but,
end probes were not. The end probes were being added using a reverse
iterator which made them run in the wrong order. This patch fixes
this by replacing the reverse iterator with a normal iterator.

1) Replaced reverse iterator with normal iterator.
2) Added testcase which checks for correct running order.
3) Updated NEWS.