MIDEAST STOCKS-Gulf retreats as oil's fall outweighs Q2 earnings

* 80 percent of Saudi shares fall
* PetroRabigh slumps on Q2 profit slide
* But Saudi Kayan jumps on surprise Q2 profit
* Dubai’s Emaar pulls back from technical resistance
* Egyptian gainers might benefit from FX devaluation
By Celine Aswad
DUBAI, July 24 (Reuters) – Gulf stock markets declined on Sunday as sharp falls in oil prices late last week outweighed a few positive corporate earnings in Saudi Arabia.
In Egypt, investors bought shares that could benefit from any currency deva