[x265] [PATCH] add testbench for psyCost_ss and asm for psyCost_ss_4x4: improve 1989c->515c

[Steve Borho]

On 01/09, Praveen Tiwari wrote:
> If it is only 64x64, then definitely it is range issue when we are finally
> accumulating sum of all sad calculations. It make more obvious with 64x64
> because more number of accumulation is here. Algorithm issue must have
> reflected in other partition also.

This was entirely my fault - I made a mistake rebasing Divya's patches
on top of Kevin's refactor of the primitives structure.  It's fixed
locally.

-- 
Steve Borho