if (OPT_IR.SANITY_CHECK) VM.assert(toAdd.next == null); if (OPT_IR.SANITY_CHECK) VM.assert(toAdd.prev == null);
if (OPT_IR.SANITY_CHECK) VM._assert(toAdd.next == null); if (OPT_IR.SANITY_CHECK) VM._assert(toAdd.prev == null);
  void insertAfterInCodeOrder(OPT_BasicBlock old, OPT_BasicBlock toAdd) {    if (OPT_IR.SANITY_CHECK) VM.assert(toAdd.next == null);    if (OPT_IR.SANITY_CHECK) VM.assert(toAdd.prev == null);    OPT_SpaceEffGraphNode oldNext = old.next;    if (oldNext == null) {      if (OPT_IR.SANITY_CHECK) VM.assert(_lastNode == old);      old.append(toAdd);      _lastNode = toAdd;    } else {      old.append(toAdd);      toAdd.append(oldNext);    }  }