[ARM] Avoid reference into modified vector (#93965) FirstCand is a reference to RepeatedSequenceLocs[0]. However, that vector is being modified a lot throughout the function, including one place that reassigns the whole vector. I'm not sure whether this can really happen in practice, but it doesn't seem unlikely that this could lead to a use-after-free. Avoid this by directly using RepeatedSequenceLocs[0] at the start of the function (as a lot of other places already do) and only creating FirstCand at the end where no more modifications take place.
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