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Optimize vp9_highbd_temporal_filter_apply_c

Following the previous patch:
(https://chromium-review.googlesource.com/c/webm/libvpx/+/1277913),
this patch modified the highbd version of applying temporal filter
in the similar way.

Change-Id: I2bb6f1fff6e32bca86f7139a497181d34aa9f3ec

--- a/vp9/encoder/vp9_temporal_filter.c

+++ b/vp9/encoder/vp9_temporal_filter.c

@@ -327,13 +327,23 @@

   const uint16_t *frame2 = CONVERT_TO_SHORTPTR(frame2_8);

   unsigned int i, j, k;

   int modifier;

-  int byte = 0;

   const int rounding = strength > 0 ? 1 << (strength - 1) : 0;

+  int diff_sse[256] = { 0 };

+  int this_idx = 0;

+

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

+    for (j = 0; j < block_width; j++) {

+      const int diff =

+          frame1[i * (int)stride + j] - frame2[i * (int)block_width + j];

+      diff_sse[this_idx++] = diff * diff;

+    }

+  }

+

+  modifier = 0;

   for (i = 0, k = 0; i < block_height; i++) {

     for (j = 0; j < block_width; j++, k++) {

-      int pixel_value = *frame2;

-      int diff_sse[9] = { 0 };

+      int pixel_value = frame2[i * (int)block_width + j];

       int idx, idy, index = 0;

       for (idy = -1; idy <= 1; ++idy) {

@@ -343,9 +353,7 @@

           if (row >= 0 && row < (int)block_height && col >= 0 &&

               col < (int)block_width) {

-            int diff = frame1[byte + idy * (int)stride + idx] -

-                       frame2[idy * (int)block_width + idx];

-            diff_sse[index] = diff * diff;

+            modifier += diff_sse[row * (int)block_width + col];

             ++index;

           }

         }

@@ -352,13 +360,9 @@

       }

       assert(index > 0);

-      modifier = 0;

-      for (idx = 0; idx < 9; ++idx) modifier += diff_sse[idx];

-

       modifier *= 3;

       modifier /= index;

-      ++frame2;

       modifier += rounding;

       modifier >>= strength;

@@ -369,11 +373,7 @@

       count[k] += modifier;

       accumulator[k] += modifier * pixel_value;

-

-      byte++;

     }

-

-    byte += stride - block_width;

   }

 }

 #endif  // CONFIG_VP9_HIGHBITDEPTH