pub fn BrotliHistogramCombine<HistogramType: SliceWrapperMut<u32> + SliceWrapper<u32> + CostAccessors + Clone>(
out: &mut [HistogramType],
cluster_size: &mut [u32],
symbols: &mut [u32],
clusters: &mut [u32],
pairs: &mut [HistogramPair],
num_clusters: usize,
symbols_size: usize,
max_clusters: usize,
max_num_pairs: usize,
scratch_space: &mut HistogramType::i32vec
) -> usize