AddressDequeue src = cycleBufferA; AddressDequeue tgt = cycleBufferB;
AddressDeque src = cycleBufferA; AddressDeque tgt = cycleBufferB;
  private final void doScanPhase() {    VM_Address object;    AddressDequeue src = cycleBufferA;    AddressDequeue tgt = cycleBufferB;    phase = SCAN;    while (!(object = src.pop()).isZero()) {      if (VM_Interface.VerifyAssertions)	VM_Interface._assert(!RCBaseHeader.isGreen(object));      scan(object);      tgt.push(object);    }  }