lpf_8_test: add missing vpx_lpf_horizontal_4 tests

mmx, msa

Change-Id: Ia9604adcdcc77411f383e081e01a18d232c9d992

test/lpf_8_test.cc

diff --git a/test/lpf_8_test.cc b/test/lpf_8_test.cc
index 45cd661..58bcb05 100644
--- a/test/lpf_8_test.cc
+++ b/test/lpf_8_test.cc
@@ -458,6 +458,7 @@
 INSTANTIATE_TEST_CASE_P(
     MMX, Loop8Test6Param,
     ::testing::Values(
+        make_tuple(&vpx_lpf_horizontal_4_mmx, &vpx_lpf_horizontal_4_c, 8, 1),
         make_tuple(&vpx_lpf_vertical_4_mmx, &vpx_lpf_vertical_4_c, 8, 1)));
 #endif  // HAVE_MMX
 
@@ -629,6 +630,7 @@
 INSTANTIATE_TEST_CASE_P(
     MSA, Loop8Test6Param,
     ::testing::Values(
+        make_tuple(&vpx_lpf_horizontal_4_msa, &vpx_lpf_horizontal_4_c, 8, 1),
         make_tuple(&vpx_lpf_horizontal_8_msa, &vpx_lpf_horizontal_8_c, 8, 1),
         make_tuple(&vpx_lpf_horizontal_16_msa, &vpx_lpf_horizontal_16_c, 8, 1),
         make_tuple(&vpx_lpf_horizontal_16_msa, &vpx_lpf_horizontal_16_c, 8, 2),