if (VM.VerifyAssertions) VM.assert((idx & TIB_MASK) == idx);
if (VM.VerifyAssertions) VM._assert((idx & TIB_MASK) == idx);
  public static void setTIB(Object ref, Object[] tib) throws VM_PragmaInline {    int idx = VM_Magic.objectAsType(tib[0]).getTibSlot() << TIB_SHIFT;    if (VM.VerifyAssertions) VM.assert((idx & TIB_MASK) == idx);    int tibWord = (VM_Magic.getIntAtOffset(ref, TIB_OFFSET) & ~TIB_MASK) | idx;    VM_Magic.setIntAtOffset(ref, TIB_OFFSET, tibWord);  }