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H A Dkern_shutdown.cdiff 243515 Sun Nov 25 14:31:08 MST 2012 avg remove stop_scheduler_on_panic knob

There has not been any complaints about the default behavior, so there
is no need to keep a knob that enables the worse alternative.

Now that the hard-stopping of other CPUs is the only behavior, the panic_cpu
spinlock-like logic can be dropped, because only a single CPU is
supposed to win stop_cpus_hard(other_cpus) race and proceed past that
call.

MFC after: 1 month

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