LAST-MINUTE OPPOSITION TO GULF BILL ARISES House Speaker Jim Wright predicted passage of legislation requiring the Reagan administration to provide Congress with a report on its Mideast Gulf policy, but a last-minute revolt by an alliance of liberals and conservatives left the bill's fate in doubt. The legislation was written in the wake of the May 17th Iraqi missile attack on the U.S. frigate Stark in the Gulf, which killed 37 Americans, and President Reagan's decision to protect 11 Kuwaiti oil tankers by putting them under U.S. flags -- effectively making them American ships. Since the administration made known its reflagging plans, congressional leaders complained they had not been consulted, and some charged the policy could lead the United States into the 6 1/2-year-old war between Iran and Iraq. The House was to vote today on a bill -- supported by the Democratic and Republican congressional leadership and the administration -- which demanded a report within seven days on plans to meet the security needs of U.S. forces in the gulf. The resolution was expected to pass without controversy today in the House Foreign Affairs Committee before the full House was to take up the bill. But in a surprise move, liberal Democrats and conservative Republicans on the committee joined in an unusual alliance to oppose the resolution. Liberal Democrats said a lack of any restrictions in the bill implied consent to Reagan's policies.