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Add sse2-optimized update_cdf function.

Thomas Daederequested to merge
tdaede/dav1d:update_cdf_4_sse2 into master

This only works for length 4 cdfs.

Cannonlake benchmarks: msac_update_cdf_c: 84.5 msac_update_cdf_sse2: 41.6

Edited by Thomas Daede

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