Replace or exclude MMX intrinsics in yuv_convert_simd_x86 due to lack of VS2010 support for them in Win64 

On Win64, exclude MMX version in ChooseFilterYUVRowsProc; still use faster 
SSE2 version. 
Replace _mm_empty() with new yasm that implements EmptyRegisterState_MMX() 
with emms in EmptyRegisterState(), ConvertYUVToRGB32_MMX(...), and 
ConvertYUVToRGB32_SSE(...). 

This patch does not fix other win64 media link errors; more work remains for 
bug 172938. 

Committing for wolenetz from : https://codereview.chromium.org/12082087/#msg15

BUG=172938, 166496
R=wolenetz@chromium.org
TBR=wolenetz@chromium.org
Review URL: https://codereview.chromium.org/12090114

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@180141 0039d316-1c4b-4281-b951-d872f2087c98
5 files changed