FOREX-Dollar bloc currencies in favour, G3 sidelined

* CAD, AUD, NZD outperform G3 peers after upbeat China PMI * Japan to announce more 'Third Arrow' policies SYDNEY, June 24 (Reuters) - The dollar-bloc currencies held onto gains early on Tuesday, having outperformed their G3 peers on optimism about Chinese growth and as the market prepared for Japan to deliver its latest instalment of long-term economic policies. The Canadian dollar traded at C ...