increase default heap size
increase default heap size

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