delegate initial instruction fetch to VM_LOOP
delegate initial instruction fetch to VM_LOOP

koba-e964/picrin,omasanori/picrin,ktakashi/picrin,koba-e964/picrin,picrin-scheme/picrin,leavesbnw/picrin,dcurrie/picrin,ktakashi/picrin,ktakashi/picrin,koba-e964/picrin,dcurrie/picrin,picrin-scheme/picrin,leavesbnw/picrin,leavesbnw/picrin,omasanori/picrin