Fix and Improve VSPClus
This MR brings the following:
- Simplification of the linkV Lookup Table (65536 -> 256 ways)
- Fix a bug in the left scan that was causing out of bounds accesses (scan was in the wrong way)
- Add UP and DOWN checks in the scans to improve the results
VSPClus's result is now closer to the reference VPClus algorithm.
Edited by Marco Cattaneo