[5.9] Fix OSSA RAUW utility's insertion point #64617
Merged
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This change ensures OSSA RAUW consistently inserts borrows before the old value. Before this it inserted new borrows before the old value only when it was in the same block as new value.
Since we can expect the users of OSSA RAUW have made sure that newValue will dominate oldValue, update the utility to always insert before the old value.
Cherry-pick of #64554