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Click on a commit to change the comparison rangeperf(mangler): optimize handling of collecting lived scope ids (#8724)
Just some low-hanging fruit optimization.
I initially want to dedupe for reference scopes, so that we can avoid calling `scope_tree.ancestors(used_scope_id).take_while(|s_id| *s_id != scope_id)` for duplicate `used_scope_id` but the overhead of calling `unique` or `dedup` is over the improvement.