Palette: use insertion sort for sorting neighbors' scores.
While sorting, preserving the order of the rest of the list when moving an element to the top of list makes hardware implementation much simpler. The compression performance is roughly same: overall, avg performance on screen-content set is 0.137% better than before in fact. Bug=aom:127 Change-Id: Id1aa1e90254b44eae9133b47bca8f853f6a62c6b
Showing with 12 additions and 9 deletions