Sharpening the saw:

o   Clobber the register that holds the restart token immediately after
    crossing the restart point. This prevents false positives (i.e. a
    nested exception that we don't know can happen and that is being
    treated as one we know by virtue of a lingering restart token).
o   Now that the bootstrap kernel stack is free, switch onto it and call
    trap() for nested traps that we don't know about. In trap we panic()
    so that we can analyze the condition.

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