SE Asia Stocks-Thai shares edge lower; Vietnam's Masan rallies after deal

BANGKOK, Dec 25 (Reuters) - Thailand's stock index snapped a two-day rising streak on Friday, led lower by large-cap energy and bank stocks while Vietnam's index touched a one-week high, with shares of Masan Group rallying after an investment deal with Singha Asia Holdings. Bangkok's SET index was down 0.1 percent on the day and 0.2 percent on the week, underperforming most other share markets in Southeast Asia. Losses were led by index heavyweight PTT Pcl and Kasikornbank Pcl, with stoc