[v9] fix: swap instances in reverse #3272
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Refactors
switchInstanceso we swap instances in reverse, handling tricky cases where we sort or shuffle elements in an array with shared objects. Previously, we had to employ clever tricks since we could only modify instances front-to-back incommitUpdate(the inherent order from React mutation effects). Now, we accumulate instances to be reconstructed in-place, and process them when we hit a tail sibling which is either the last sibling in a view, or the last sibling in a sequence with an update.