setHead(head.add(WORD_SIZE));
head = head.add(WORD_SIZE);
  protected final void uncheckedPush(int value) throws VM_PragmaInline {    if (VM.VerifyAssertions)       VM._assert(bufferOffset(head) <= bufferLastOffset(queue.getArity()));    VM_Magic.setMemoryWord(head, value);    setHead(head.add(WORD_SIZE));    //    if (VM.VerifyAssertions) enqueued++;  }