VM.assert(false);
VM._assert(false);
  static boolean gc_isLive (VM_Address ref) throws VM_PragmaUninterruptible {    if (bootHeap.refInHeap(ref)) {      return bootHeap.isLive(ref);    } else if (immortalHeap.refInHeap(ref)) {      return immortalHeap.isLive(ref);    } else if (smallHeap.refInHeap(ref)) {      return smallHeap.isLive(ref);    } else if (largeHeap.refInHeap(ref)) {      return largeHeap.isLive(ref);    } else {      VM.sysWrite("gc_isLive: ref not in any known heap: ", ref);      VM.assert(false);      return false;    }  }