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`rename_index`: add the new index before removing the old one.
This prevents the following error when a MySQL index on a foreign key column is renamed: ``` ActiveRecord::StatementInvalid: Mysql2::Error: Cannot drop index 'index_engines_on_car_id': needed in a foreign key constraint: DROP INDEX `index_engines_on_car_id` ON `engines` ``` refs: #13038.
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