By Nivedita Balu (Reuters) -Elon Musk on Thursday said he has lined up $46.5 billion in debt and equity financing to buy Twitter Inc and is considering taking his offer directly to shareholders, a filing with U.S. regulators showed. Musk himself has committed to put up $33.5 billion, which will include $21 billion of equity and $12.5 billion of margin loans against some of his Tesla Inc shares to finance the transaction. He is chief executive officer of electric vehicle maker Tesla. Musk, the world’s richest person according to a tally by Forbes, on April 14 presented a “best and final” cash o…