By Howard Schneider and Lindsay Dunsmuir WASHINGTON (Reuters) – U.S. jobs gains of 390,000 in May and still strong wage growth leave the Federal Reserve on track for half point interest rate increases in June and July as the U.S. economy continued to show little evidence it is buckling under the pressure of high inflation and rising interest rates. The May job gains, coupled with revisions in the March and April data, mean the economy continued to add about 400,000 jobs monthly even as the Fed began to tighten monetary policy in March, equity markets sank, and fears of a recession rose. Yet th…