MIDEAST STOCKS-Saudi surges 7.4 pct in heavy trade as region rebounds

* Saudi trading volume highest since May 2014 * Top petrochemical firm SABIC up 10 pct daily limit * Dollar/Saudi riyal forwards, Saudi CDS pull back * Other Gulf markets up but close before much of global rally * Egypt's Palm Hills Development bounces 8.7 percent By Andrew Torchia DUBAI, Aug 25 (Reuters) - Saudi Arabia's stock market surged 7.4 percent on Tuesday as the region rebounded from several days of heavy selling, encouraged by stronger oil prices and rising glo