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Enforce motion search range clamp for sub8x8

This commit constrains the maximal motion search range for sub8x8
blocks to be [-1023, 1023], in the unit of full pixel.

Change-Id: I955b60649364ab410f2453cafd46a496f2fcb43e

--- a/vp9/encoder/vp9_rdopt.c

+++ b/vp9/encoder/vp9_rdopt.c

@@ -1781,6 +1781,9 @@

           further_steps = (MAX_MVSEARCH_STEPS - 1) - step_param;

           // adjust src pointer for this block

           mi_buf_shift(x, i);

+

+          vp9_clamp_mv_min_max(x, &bsi->ref_mv->as_mv);

+

           if (cpi->sf.search_method == HEX) {

             bestsme = vp9_hex_search(x, &mvp_full.as_mv,

                                      step_param,

-- 

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