Try using `new_zeroed_slice` to optimize `f.mvs` with zeroed allocations#1360

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kkysen wants to merge 2 commits intomainfrom

kkysen/f-mvs-new_zeroed_slice

Commits on Sep 24, 2024

`fn DisjointMutArcSlice::new_zeroed_slice`: Add constructor that uses zeroed allocations to optimize out initialization, and use this on `f.mvs`.
kkysen
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Commits on Oct 31, 2024

`struct Rav1dFrameData::mvs`: Avoid re-allocating `f.mvs` if the length doesn't change.
kkysen
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