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SSE2, msac: Use bsr shortcut for 50% bool decoding

Kyle Siefring requested to merge KyleSiefring/dav1d:decode_bool_equi_magic_bsr_trick into master

Works via magic. shift always be 0, 1, or 2 and v is never in 0b11.*. It's a pity the shift isn't always 1.

~0.2%, but I believe this on a single threaded part. I think I might be able to get it slightly faster by removing the neg, but need suggestions on the route to take.

Edited by Kyle Siefring

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