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Update high bitdepth load_input_data() in x86

BUG=webm:1412

Change-Id: Ibf9d120b80c7d3a7637e79e123cf2f0aae6dd78c

--- a/vpx_dsp/x86/inv_txfm_sse2.h

+++ b/vpx_dsp/x86/inv_txfm_sse2.h

@@ -80,8 +80,20 @@

 // highbitdepth enabled

 static INLINE __m128i load_input_data(const tran_low_t *data) {

 #if CONFIG_VP9_HIGHBITDEPTH

-  return octa_set_epi16(data[0], data[1], data[2], data[3], data[4], data[5],

-                        data[6], data[7]);

+  // in0: 0 X 1 X  2 X 3 X

+  // in1: 4 X 5 X  6 X 7 X

+  // t0:  0 4 X X  1 5 X X

+  // t1:  2 6 X X  3 7 X X

+  // t2:  0 2 4 6  X X X X

+  // t3:  1 3 5 7  X X X X

+  // rtn: 0 1 2 3  4 5 6 7

+  const __m128i in0 = _mm_load_si128((const __m128i *)data);

+  const __m128i in1 = _mm_load_si128((const __m128i *)(data + 4));

+  const __m128i t0 = _mm_unpacklo_epi16(in0, in1);

+  const __m128i t1 = _mm_unpackhi_epi16(in0, in1);

+  const __m128i t2 = _mm_unpacklo_epi16(t0, t1);

+  const __m128i t3 = _mm_unpackhi_epi16(t0, t1);

+  return _mm_unpacklo_epi16(t2, t3);

 #else

   return _mm_load_si128((const __m128i *)data);

 #endif