fdct8x8_test: add missing avx2 functions

exercises the forward transforms
no idct/iht implementations, so the c-code is used

Change-Id: I76b4d1712f10225c1ffa5ffb0ed9a551e68b93b4

test/fdct8x8_test.cc

@@ -367,4 +367,18 @@ INSTANTIATE_TEST_CASE_P(
     ::testing::Values(
         make_tuple(&vp9_fdct8x8_ssse3, &vp9_idct8x8_64_add_ssse3, 0)));
 #endif
+
+#if HAVE_AVX2
+INSTANTIATE_TEST_CASE_P(
+    AVX2, FwdTrans8x8DCT,
+    ::testing::Values(
+        make_tuple(&vp9_fdct8x8_avx2, &vp9_idct8x8_64_add_c, 0)));
+INSTANTIATE_TEST_CASE_P(
+    AVX2, FwdTrans8x8HT,
+    ::testing::Values(
+        make_tuple(&vp9_fht8x8_avx2, &vp9_iht8x8_64_add_c, 0),
+        make_tuple(&vp9_fht8x8_avx2, &vp9_iht8x8_64_add_c, 1),
+        make_tuple(&vp9_fht8x8_avx2, &vp9_iht8x8_64_add_c, 2),
+        make_tuple(&vp9_fht8x8_avx2, &vp9_iht8x8_64_add_c, 3)));
+#endif
 }  // namespace