Plan.releaseVMResource(start, bytes.toInt());
Plan.releaseVMResource(start, bytes);
  public void release() {    // Unmapping is useful for being a "good citizen" and for debugging    VM_Extent bytes = cursor.diff(start).toWord().toExtent();    int pages = Conversions.bytesToPages(bytes);    if (ZERO_ON_RELEASE)         Memory.zero(start, bytes);    if (Options.protectOnRelease)      LazyMmapper.protect(start, pages);    releaseHelp(start, pages);    cursor = start;    //-if RVM_WITH_GCSPY    if (VM_Interface.GCSPY)      Plan.releaseVMResource(start, bytes.toInt());    //-endif  }