neon hadamard 8x8

Runs about 30% faster than the C

BUG=webm:1021

Change-Id: I6809d6d84c3077ab619c53298296950e976bdaba

test/hadamard_test.cc

diff --git a/test/hadamard_test.cc b/test/hadamard_test.cc
index 0bf6f4a..400939a 100644
--- a/test/hadamard_test.cc
+++ b/test/hadamard_test.cc
@@ -123,4 +123,9 @@
 INSTANTIATE_TEST_CASE_P(SSSE3, HadamardTest,
                         ::testing::Values(&vpx_hadamard_8x8_ssse3));
 #endif  // HAVE_SSSE3 && CONFIG_USE_X86INC && ARCH_X86_64
+
+#if HAVE_NEON
+INSTANTIATE_TEST_CASE_P(NEON, HadamardTest,
+                        ::testing::Values(&vpx_hadamard_8x8_neon));
+#endif  // HAVE_NEON
 }  // namespace