if (VM_Interface.VerifyAssertions) VM_Interface._assert(newValue <= INCREMENT_LIMIT);
  static void incRC(VM_Address object)    throws VM_PragmaUninterruptible, VM_PragmaInline {    int oldValue, newValue;    do {      oldValue = VM_Magic.prepareInt(object, RC_HEADER_OFFSET);      newValue = oldValue + INCREMENT;      if (Plan.REF_COUNT_CYCLE_DETECTION) newValue = (newValue & ~PURPLE);    } while (!VM_Magic.attemptInt(object, RC_HEADER_OFFSET, oldValue, newValue));  }