BUG=libyuv:634

Change-Id: Ida80027c36a938a3bcf6f4480626f8eb9495e1be

Performance Gain (vs C auto-vectorized)
I444ToARGBRow_MSA       - ~1.6x
I444ToARGBRow_Any_MSA   - ~1.6x
I400ToARGBRow_MSA       - ~5.5x
I400ToARGBRow_Any_MSA   - ~5.3x
J400ToARGBRow_MSA       - ~1.0x
J400ToARGBRow_Any_MSA   - ~1.0x
YUY2ToARGBRow_MSA       - ~1.6x
YUY2ToARGBRow_Any_MSA   - ~1.6x
UYVYToARGBRow_MSA       - ~1.6x
UYVYToARGBRow_Any_MSA   - ~1.6x

Performance Gain (vs C non-vectorized)
I444ToARGBRow_MSA       - ~7.3x
I444ToARGBRow_Any_MSA   - ~7.1x
I400ToARGBRow_MSA       - ~5.5x
I400ToARGBRow_Any_MSA   - ~5.2x
J400ToARGBRow_MSA       - ~6.8x
J400ToARGBRow_Any_MSA   - ~5.7x
YUY2ToARGBRow_MSA       - ~7.2x
YUY2ToARGBRow_Any_MSA   - ~7.0x
UYVYToARGBRow_MSA       - ~7.1x
UYVYToARGBRow_Any_MSA   - ~6.9x

Change-Id: Ida80027c36a938a3bcf6f4480626f8eb9495e1be
Reviewed-on: https://chromium-review.googlesource.com/439246Reviewed-by: Frank Barchard <fbarchard@google.com>
Commit-Queue: Frank Barchard <fbarchard@google.com>