July 21 (Reuters) - Gold edged up on Tuesday after scaling a near nine-year high in the previous session, as demand was boosted by worries over a spike in COVID-19 cases and expectations of higher inflation from more stimulus measures to mitigate the economic blow. * Rising coronavirus cases in the United States has intensified fears over a global economic recovery, driving fund flows into safe-haven assets. * Gold tends to benefit from widespread stimulus measures from central banks because it is widely viewed as a hedge against inflation and currency debasement.