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Improving performance of original dav1d video decoder

@another, @mstorsjo,

I noticed a very clickbait bounty, I initially realized that company's original task was not to overtake implementation, but to advertise that Rust is 5% slower than C. Whether she actually pays or not is another matter. The main thing for Prossimo was to make a fuss that the current rav1d implementation was only 5% slower, so that the general public would think that the language was the same in speed. This PR will decrease costs copying, moving, and creating object-structures only for common 64bit processors due to the 8-byte data alignment.

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