SINGAPORE (Reuters) – Facebook co-founder Eduardo Saverin, who renounced his U.S. citizenship earlier this year, made his debut on a Singapore rich list published by Forbes Magazine. Brazilian-born Saverin, 30, is No.8 on the list with an estimated net worth of $2.2 billion. Saverin has been living in Singapore since 2009 but only gave up his U.S. citizenship ahead of Facebook’s initial public offering. The Southeast Asian city-state, which has no capital gains tax, is the main Asian center for private banking and has long been a magnet for wealthy people from around the region. …