SYDNEY (Reuters) - Asian shares rebounded on Tuesday as a day passed without a new escalation in the Middle East and Wall Street erased early losses to end in the black as tech stocks climbed. Oil surrendered some hefty gains as many doubted Iran would strike back in a way that would disrupt supplies, and its own crude exports. Brent crude futures stood at $68.91 a barrel, having been as high as $70.74 at one stage, while U.S. crude fell 32 cents to $62.95.Gold held firm at $1,563.50,..