public void growNumLists(int newListSize) {
        if (newListSize <= numLists) {
            return;
        }
        int[] temp = heads;
        heads = new int[newListSize];
        System.arraycopy(temp, 0, heads, 0, temp.length);
        Arrays.fill(heads,temp.length,heads.length, END_OF_LIST);
        numLists = newListSize;
    }
Increases the number of managed linked lists.
@param newListSize the new number of linked lists.  If this number is
smaller than the current number of linked lists, then nothing changes.
Ghidra/Framework/Generic/src/main/java/ghidra/util/datastruct/IntListIndexer.java