* Stop other cpus when one cpu enters DDB and restart them after it   leaves. * Add a sync.i instruction to the code which writes out breakpoints to   ensure that the breakpoint is seem by all cpus in the coherence domain.
* Stop other cpus when one cpu enters DDB and restart them after it
  leaves.
* Add a sync.i instruction to the code which writes out breakpoints to
  ensure that the breakpoint is seem by all cpus in the coherence domain.

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