Z80 Routines:Optimized:CpHLDE

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This is a faster/smaller replacement for the typical CpHLDE routine.

Typical routine: 

CpHLDE:
  push hl
  or a
  sbc hl,de
  pop hl
  ret

Better routine: 

CpHLDE:
  or a
  sbc hl,de
  add hl,de
  ret
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