ANKARA, Oct 9 (Reuters) - An Iranian Revolutionary Guards general has been killed near Aleppo, where he was advising the Syrian army on their battle against Islamic State fighters, the guards said in a statement on Friday. General Hussein Hamedani was killed late on Wednesday, the statement said. Iran is the main regional ally of Syrian President Bashar al-Assad, and has provided military and economic support during Syria's four-year-old civil war.