Remove the unused aom_fdct8x8_1_sse2() function.

Change-Id: Ica39fd4d527c002b8f64cb961eff8911c0444bc2

aom_dsp/x86/fwd_txfm_sse2.c

diff --git a/aom_dsp/x86/fwd_txfm_sse2.c b/aom_dsp/x86/fwd_txfm_sse2.c
index 2d8f8f7..6b7c11b 100644
--- a/aom_dsp/x86/fwd_txfm_sse2.c
+++ b/aom_dsp/x86/fwd_txfm_sse2.c
@@ -17,46 +17,6 @@
 #include "aom_dsp/aom_dsp_common.h"
 #include "aom_dsp/x86/fwd_txfm_sse2.h"
 
-void aom_fdct8x8_1_sse2(const int16_t *input, tran_low_t *output, int stride) {
-  __m128i in0 = _mm_load_si128((const __m128i *)(input + 0 * stride));
-  __m128i in1 = _mm_load_si128((const __m128i *)(input + 1 * stride));
-  __m128i in2 = _mm_load_si128((const __m128i *)(input + 2 * stride));
-  __m128i in3 = _mm_load_si128((const __m128i *)(input + 3 * stride));
-  __m128i u0, u1, sum;
-
-  u0 = _mm_add_epi16(in0, in1);
-  u1 = _mm_add_epi16(in2, in3);
-
-  in0 = _mm_load_si128((const __m128i *)(input + 4 * stride));
-  in1 = _mm_load_si128((const __m128i *)(input + 5 * stride));
-  in2 = _mm_load_si128((const __m128i *)(input + 6 * stride));
-  in3 = _mm_load_si128((const __m128i *)(input + 7 * stride));
-
-  sum = _mm_add_epi16(u0, u1);
-
-  in0 = _mm_add_epi16(in0, in1);
-  in2 = _mm_add_epi16(in2, in3);
-  sum = _mm_add_epi16(sum, in0);
-
-  u0 = _mm_setzero_si128();
-  sum = _mm_add_epi16(sum, in2);
-
-  in0 = _mm_unpacklo_epi16(u0, sum);
-  in1 = _mm_unpackhi_epi16(u0, sum);
-  in0 = _mm_srai_epi32(in0, 16);
-  in1 = _mm_srai_epi32(in1, 16);
-
-  sum = _mm_add_epi32(in0, in1);
-  in0 = _mm_unpacklo_epi32(sum, u0);
-  in1 = _mm_unpackhi_epi32(sum, u0);
-
-  sum = _mm_add_epi32(in0, in1);
-  in0 = _mm_srli_si128(sum, 8);
-
-  in1 = _mm_add_epi32(sum, in0);
-  output[0] = (tran_low_t)_mm_cvtsi128_si32(in1);
-}
-
 #define DCT_HIGH_BIT_DEPTH 0
 #define FDCT8x8_2D aom_fdct8x8_sse2
 #include "aom_dsp/x86/fwd_txfm_impl_sse2.h"