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intrapred: sync highbd_d45_predictor w/d45_

8/16/32:: ~19%/~54%/~75.5% faster

previously:
acc481eaa vp9_reconintra: simplify d45_predictor

BUG=webm:1411

Change-Id: Ie8340b0c5070ae640f124733f025e4e749b660d8

--- a/vpx_dsp/intrapred.c

+++ b/vpx_dsp/intrapred.c

@@ -504,15 +504,20 @@

 static INLINE void highbd_d45_predictor(uint16_t *dst, ptrdiff_t stride, int bs,

                                         const uint16_t *above,

                                         const uint16_t *left, int bd) {

-  int r, c;

+  const uint16_t above_right = above[bs - 1];

+  const uint16_t *const dst_row0 = dst;

+  int x, size;

   (void)left;

   (void)bd;

-  for (r = 0; r < bs; ++r) {

-    for (c = 0; c < bs; ++c) {

-      dst[c] = r + c + 2 < bs * 2

-                   ? AVG3(above[r + c], above[r + c + 1], above[r + c + 2])

-                   : above[bs * 2 - 1];

-    }

+

+  for (x = 0; x < bs - 1; ++x) {

+    dst[x] = AVG3(above[x], above[x + 1], above[x + 2]);

+  }

+  dst[bs - 1] = above_right;

+  dst += stride;

+  for (x = 1, size = bs - 2; x < bs; ++x, --size) {

+    memcpy(dst, dst_row0 + x, size * sizeof(*dst));

+    vpx_memset16(dst + size, above_right, x + 1);

     dst += stride;

   }

 }