VM_Finalizer.setup();
  static void boot(VM_BootRecord bootrecord) {    verbose = bootrecord.verboseGC;    // attatch heaps.    if (verbose >= 2) VM.sysWriteln("Attaching heaps");    VM_Heap.boot(bootHeap, null, bootrecord);    immortalHeap.attach(bootrecord.smallSpaceSize);    VM_GCUtil.boot();    VM_Finalizer.setup();  }