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vpx_highbd_d153_predictor_4x4_sse2: reduce load size

this avoids reading 4 pixels into another block, which may be operated
on by a different thread. quiets a tsan warning.

Change-Id: Id27ad9d61819b0e5de0230647b4b510f7c265a71

--- a/vpx_dsp/x86/highbd_intrapred_intrin_sse2.c

+++ b/vpx_dsp/x86/highbd_intrapred_intrin_sse2.c

@@ -460,7 +460,8 @@

   const int J = left[1];

   const int K = left[2];

   const int L = left[3];

-  const __m128i XXXXXABC = _mm_loadu_si128((const __m128i *)(above - 5));

+  const __m128i XXXXXABC = _mm_castps_si128(

+      _mm_loadh_pi(_mm_setzero_ps(), (const __m64 *)(above - 1)));

   const __m128i LXXXXABC = _mm_insert_epi16(XXXXXABC, L, 0);

   const __m128i LKXXXABC = _mm_insert_epi16(LXXXXABC, K, 1);

   const __m128i LKJXXABC = _mm_insert_epi16(LKXXXABC, J, 2);