Add MSA optimized ARGB/ABGR/BGRA/RGBA To Y/UV row functions
R=fbarchard@google.com BUG=libyuv:634 Performance Gain (vs C auto-vectorized) ARGBToYJRow_MSA - ~3.2x ARGBToYJRow_Any_MSA - ~2.7x BGRAToYRow_MSA - ~3.2x BGRAToYRow_Any_MSA - ~2.7x ABGRToYRow_MSA - ~3.2x ABGRToYRow_Any_MSA - ~2.6x RGBAToYRow_MSA - ~3.1x RGBAToYRow_Any_MSA - ~2.7x ARGBToUVJRow_MSA - ~5.5x ARGBToUVJRow_Any_MSA - ~4.5x BGRAToUVRow_MSA - ~2.1x BGRAToUVRow_Any_MSA - ~2.0x ABGRToUVRow_MSA - ~2.1x ABGRToUVRow_Any_MSA - ~1.9x RGBAToUVRow_MSA - ~2.2x RGBAToUVRow_Any_MSA - ~1.9x Performance Gain (vs C non-vectorized) ARGBToYJRow_MSA - ~10.9x ARGBToYJRow_Any_MSA - ~9.2x BGRAToYRow_MSA - ~10.9x BGRAToYRow_Any_MSA - ~9.3x ABGRToYRow_MSA - ~11.0x ABGRToYRow_Any_MSA - ~9.3x RGBAToYRow_MSA - ~10.9x RGBAToYRow_Any_MSA - ~9.1x ARGBToUVJRow_MSA - ~12.4x ARGBToUVJRow_Any_MSA - ~10.5x BGRAToUVRow_MSA - ~4.7x BGRAToUVRow_Any_MSA - ~4.4x ABGRToUVRow_MSA - ~4.7x ABGRToUVRow_Any_MSA - ~4.5x RGBAToUVRow_MSA - ~4.8x RGBAToUVRow_Any_MSA - ~4.4x Review-Url: https://codereview.chromium.org/2641153003 .
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