SummaryCompaniesEuro bond sales by US firms at year-to-date record of $100 billionAttractive borrowing costs, currency diversification lead pushFund flows signal increased preference for euro debt - INGSept 16 (Reuters) - U.S. companies are lining up to borrow in euros with bond sales hitting a record $100 billion so far this year, reflecting attractive European funding conditions and a growing willingness among issuers and investors to shift away from the dollar.The likes of Google-parent Alpha...