Marcel Moolenaar 86f4f6f7b8 Improve on cpu_set_upcall:
o  Use pcb and tf for the new pcb and the new trapframe and use pcb0
   for the old (current) pcb. The mix of pcb, pcb2 and tf was slightly
   confusing.
o  Don't define td->td_frame here. It has already been set previously
   by cpu_thread_setup. Add a KASSERT to make sure pcb and tf are both
   non-NULL.
o  Make sure the number of dirty registers is 0 for the new thread.
   There are no user registers on the backing store because we heven't
   enter userland yet.
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