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Correct 3 step search site initialziation

39c7b01d accidently reverted the row/col initialization, which broke
mv clamps, which is dependent on the sites for valid motion vector
range. This commit fixed the issue.

Change-Id: Ibcce0226e0360b1ef483fe760b2e33f1af4bf494

--- a/vp9/encoder/vp9_mcomp.c

+++ b/vp9/encoder/vp9_mcomp.c

@@ -144,8 +144,8 @@

   for (len = MAX_FIRST_STEP; len > 0; len /= 2) {

     // Generate offsets for 8 search sites per step.

     const MV ss_mvs[8] = {

-      { 0,   -len}, {0,    len}, {-len,  0  }, {len,  0  },

-      {-len, -len}, {len, -len}, {-len,  len}, {len,  len}

+      {-len,  0  }, {len,  0  }, { 0,   -len}, {0,    len},

+      {-len, -len}, {-len, len}, {len,  -len}, {len,  len}

     };

     int i;

     for (i = 0; i < 8; ++i) {