[IA64] kdump: Short path to freeze CPUs

Setting monarch_cpu = -1 to let slaves frozen might not work, because
there might be slaves being late, not entered the rendezvous yet.
Such slaves might be caught in while (monarch_cpu == -1) loop.

Use kdump_in_progress instead of monarch_cpus to break INIT rendezvous
and let all slaves enter DIE_INIT_SLAVE_LEAVE smoothly.

And monarch no longer need to manage rendezvous if once kdump_in_progress
is set, catch the monarch in DIE_INIT_MONARCH_ENTER then.

Signed-off-by: Hidetoshi Seto <[email protected]>
Cc: Vivek Goyal <[email protected]>
Cc: Haren Myneni <[email protected]>
Cc: [email protected]
Acked-by: Fenghua Yu <[email protected]>
Signed-off-by: Tony Luck <[email protected]>

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