HammingDistance_SSSE3 use movd not vmovd

vmovd is an AVX instruction.  This will crash on an older CPU with
only SSSE3 but not AVX.  Use movd instead.

Bug: libyuv:753
Test: ~/intelsde/sde -mrm -- out/Release/libyuv_unittest --gtest_filter=LibYUVCompareTest.BenchmarkHammingDistance_Opt
Change-Id: I1fb0026039d5f83d124f5d03fed7dc0d2d723e49
Reviewed-on: https://chromium-review.googlesource.com/756200Reviewed-by: Cheng Wang <wangcheng@google.com>
Reviewed-by: richard winterton <rrwinterton@gmail.com>

source/compare_gcc.cc

@@ -160,7 +160,7 @@ uint32 HammingDistance_SSSE3(const uint8* src_a,
 
       "pshufd     $0xaa,%%xmm0,%%xmm1            \n"
       "paddd      %%xmm1,%%xmm0                  \n"
-      "vmovd      %%xmm0, %3                     \n"
+      "movd       %%xmm0, %3                     \n"
       : "+r"(src_a),       // %0
         "+r"(src_b),       // %1
         "+r"(count),       // %2