MFC r196132:   Add ddb show dpcpu_off command to ease dpcpu memory debugging.   While show pcpu prints pc_dynamic this also prints the original   memory address as well as the maths.
MFC r196132:
  Add ddb show dpcpu_off command to ease dpcpu memory debugging.
  While show pcpu prints pc_dynamic this also prints the original
  memory address as well as the maths.

  Once dpcpu goes NUMA this is considered to help debugging as well.

  Reviewed by:  rwatson

Approved by:	re

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