protected static final void releaseVMResource(VM_Address start, int bytes) {
protected static final void releaseVMResource(VM_Address start, VM_Extent bytes) {
  protected static final void releaseVMResource(VM_Address start, int bytes) {    //Log.write("Plan.releaseVMResource:", start);    //Log.write("-", start.add(bytes));    //Log.writeln(", bytes released: ", bytes);    //reportSpaces();    objectMap.release(start, bytes);    }