By Herbert Lash and Marc Jones NEW YORK/LONDON (Reuters) – The yen spiked higher on Thursday after the Federal Reserve’s strong stance on rates the day before roiled the outlook for bonds and stocks while forcing Japan to unilaterally intervene in FX markets to support its currency for the first time since 1998. The dollar slid after earlier surging to fresh two-decade highs following the Fed’s raising of interest rates on Wednesday by a hefty 75 basis points. Its projection of more large increases to come cemented a view for rates of “higher for longer.” The bond market responded with the par…