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Reduces memory usage (by 3 kB per sb128 for 4:2:0) when decoding streams with subsampled chroma when frame threading is enabled. This also simplifies the logic for calculating cbi indices. Both entropy decoding and reconstruction access the elements in the same order, so calculating block x/y positions is redundant and we can instead just store values sequentially and increase the pointer by one every time it's accessed.
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