MIDEAST STOCKS-Egypt continues rally on IMF; Saudi strong, rest of Gulf hit by global weakness

* Egyptian index up for 12th straight session * Financial, export-oriented shares chief gainers * Saudi confirms break above technical barrier on August peak * Mobily surges on arbitration award * MSCI shares are main losers in UAE, Qatar By Celine Aswad DUBAI, Nov 13 (Reuters) - Egypt's stock market gained for a 12th straight session on Sunday after the International Monetary Fund approved a $12 billion loan for the country, while Saudi Arabia rose, bucking a downtrend in the rest of the Gulf.