$wpdb should update ->insert_id also when `LAST_INSERT_ID(...)` is found

[cpiber]

It is possible to set the insert id pointer manually by in including LAST_INSERT_ID(column) anywhere in the statement. $wpdb however does not update it's internal insert_id, it does this only when the statement is 'insert' or 'replace'. This makes it harder to get the ID of an updated row.
​https://stackoverflow.com/a/46335863