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vp9_reconintra: specialize d135 4x4

based on webp's RD4()

Change-Id: I64c8f0a1325a8f201eaad39b396fae7a2d06efff

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

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

@@ -538,6 +538,27 @@

 }

 intra_pred_no_4x4(d117)

+void vp9_d135_predictor_4x4(uint8_t *dst, ptrdiff_t stride,

+                            const uint8_t *above, const uint8_t *left) {

+  const int I = left[0];

+  const int J = left[1];

+  const int K = left[2];

+  const int L = left[3];

+  const int X = above[-1];

+  const int A = above[0];

+  const int B = above[1];

+  const int C = above[2];

+  const int D = above[3];

+  (void)stride;

+  DST(0, 3)                                     = AVG3(J, K, L);

+  DST(1, 3) = DST(0, 2)                         = AVG3(I, J, K);

+  DST(2, 3) = DST(1, 2) = DST(0, 1)             = AVG3(X, I, J);

+  DST(3, 3) = DST(2, 2) = DST(1, 1) = DST(0, 0) = AVG3(A, X, I);

+              DST(3, 2) = DST(2, 1) = DST(1, 0) = AVG3(B, A, X);

+                          DST(3, 1) = DST(2, 0) = AVG3(C, B, A);

+                                      DST(3, 0) = AVG3(D, C, B);

+}

+

 static INLINE void d135_predictor(uint8_t *dst, ptrdiff_t stride, int bs,

                                   const uint8_t *above, const uint8_t *left) {

   int r, c;

@@ -557,7 +578,7 @@

     dst += stride;

   }

 }

-intra_pred_allsizes(d135)

+intra_pred_no_4x4(d135)

 void vp9_d153_predictor_4x4_c(uint8_t *dst, ptrdiff_t stride,

                               const uint8_t *above, const uint8_t *left) {