Pruned subpel search for speed 3.
Adds code to return an integer cost list for NSTEP search. Then uses it for pruned subpel search in speed 3. derf: -0.06% Speed on mobcal 720p increaes from 10.28 fps to 10.65 fps. [Subject to further testing]. Change-Id: Ib591382d25b2c11bcaba9d3a27a93a9d1ab27a96
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