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Merge "vpx_dsp/x86/avg_intrin_sse2: fix int sanitizer warnings"

--- a/vpx_dsp/x86/avg_intrin_sse2.c

+++ b/vpx_dsp/x86/avg_intrin_sse2.c

@@ -571,7 +571,7 @@

   v1 = _mm_srli_epi64(sse, 32);

   sse = _mm_add_epi32(sse, v1);

-  mean = _mm_extract_epi16(sum, 0);

+  mean = (int16_t)_mm_extract_epi16(sum, 0);

   return _mm_cvtsi128_si32(sse) - ((mean * mean) >> (bwl + 2));

 }