add a entry to the policy about fixing warnings (i think this is common sense but if anydeveloper disagrees, just say so
and ill revert it and we can disscuss it on ffmpeg-dev)

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and get rid of the data swapping.

Patch by Ian Braithwaite <dk dot braithwaite at ian>

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so VARIANT0 will be big and a few % faster, VARIANT1/2 are unaffected

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