improve method #2 by merging DistoRefine() and
 SimpleQuantize()

it's now a single function, that reconstructs the intra4x4 block during the scan
The I4_PENALTY had to be adjusted.

Overall, result is better quality-wise (esp. at q < 50), and a tad faster too.

method #0, #1 and #3+ are unchanged

Change-Id: If262aeb552397860b3dd532df8df6b1357779222
1 file changed