if (RefCountSpace.RC_SANITY_CHECK) sanityEnum = new RCSanityEnumerator(rc);
  public Plan() {    decBuffer = new AddressDeque("dec buf", decPool);    newRootSet = new AddressDeque("new root set", newRootPool);    los = new RefCountLOSLocal(losVM, rcMR);    rc = new RefCountLocal(rcSpace, this, los, decBuffer, newRootSet);    decEnum = new RCDecEnumerator(this);  }