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vp9_reconintra/d45_predictor: remove temp storage

dst row 0 can be reused in the same way

Change-Id: Id977da62545dcc4a89cebbcbad90ba84f8ff5d6b

--- a/vp9/common/vp9_reconintra.c

+++ b/vp9/common/vp9_reconintra.c

@@ -464,15 +464,17 @@

 static INLINE void d45_predictor(uint8_t *dst, ptrdiff_t stride, int bs,

                                  const uint8_t *above, const uint8_t *left) {

   const uint8_t above_right = above[bs - 1];

+  const uint8_t *const dst_row0 = dst;

   int x, size;

-  uint8_t avg[31];  // TODO(jzern): this could be block size specific

   (void)left;

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

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

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

   }

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

-    memcpy(dst, avg + x, size);

+  dst[bs - 1] = above_right;

+  dst += stride;

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

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

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

     dst += stride;

   }