By Makiko Yamazaki TOKYO (Reuters) – Japan’s troubled Toshiba Corp goes into a critical shareholder vote later on Thursday facing very long odds for winning support for its plan to spin-off its devices business. Its top three shareholders – Effissimo Capital Management, 3D Investment Partners and Farallon Capital Management – all activist shareholders with which Toshiba management has had a contentious history – oppose the plan as do proxy advisory firms Institutional Shareholder Services (ISS) and Glass Lewis. Also on the table is a proposal from Singapore-based 3D calling for Toshiba to soli…