Saudi Aramco, the world’s biggest crude oil exporter and the Saudi state-owned oil giant, is back tapping the debt markets this year with an offering of dollar-denominated Islamic bonds, Bloomberg reported on Wednesday, citing a source with knowledge of the plans. Aramco is said to be offering Islamic bonds, the so-called sukuk, in five and ten-year issuances in what would be the Saudi oil firm’s second debt issue this year and Saudi Arabia’s third in one week. In May, Saudi Aramco issued a total of $5 billion in…