TOKYO (Reuters) - Toshiba Corp (6502. T) announced on Thursday it is shedding assets, cutting jobs and buying back its stock starting this week, sending its shares up 13 percent, as the once-mighty Japanese conglomerate aims to regain investor confidence. FILE PHOTO: The logo of Toshiba Corp is seen behind cherry blossoms at the company's headquarters in Tokyo, Japan April 11, 2017. REUTERS/Toru Hanai The company announced it is liquidating its British nuclear power unit and selling its U.S.