VM_Interface.resetThreadCounter();
  protected final void globalPrepare() {    nurseryMR.reset();    CopySpace.prepare(nurseryVM, nurseryMR);    msSpace.prepare(msVM, msMR);    ImmortalSpace.prepare(immortalVM, null);    losSpace.prepare(losVM, losMR);    VM_Interface.resetThreadCounter();  // necessary for preCopyGCInstances()  }