Avoid a theoretical race condition.

In fork1(), setup the p_{prof,virt}_to timeouts _before_ putting the process
on the runqueue.  Since SCHED_UNLOCK() can cause pre-emption, it is possible
(with the old code) for the newly created process to run and become curproc
before the timeouts were set.  If itimers are set early, and you're unlucky,
hardclock() might fire at this time and attempt timeout_add() on the unset
timeouts, leading to "panic: timeout_add: not initialized".

deraadt@, miod@ ok

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