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Johann authored
Provides over 15x speedup for width > 8. Due to smaller loads and shifting for width == 8 it gets about 8x speedup. For width == 4 it's only about 4x speedup because there is a lot of shuffling and shifting to get the data properly situated. BUG=webm:1390 Change-Id: Ice0b3dbbf007be3d9509786a61e7f35e94bdffa8
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