By Huw Jones and Tom Wilson LONDON (Reuters) -European Union lawmakers backed new safeguards for tracing transfers of bitcoin and other cryptocurrencies on Thursday, in the latest sign that regulators are tightening up on the freewheeling sector. Two committees in the European Parliament jointly voted by 93 in favour and 14 against on cross-party compromises which crypto exchange Coinbase Global Inc warned would usher in a surveillance regime that stifles innovation. The $2.1 trillion crypto sector is still subject to patchy regulation across the world. Under the draft law first put forward la…