AMC Entertainment Holdings jumped sharply, extending the previous week's 85% gain. (Updates to market close) By Stephen Culp NEW YORK, June 7 (Reuters) - The S&P 500 ended a languid session nominally lower on Monday, with investors standing by on news of a global minimum corporate tax rate, lingering inflation fears, and a lack of market-moving catalysts. Lawmakers in Washington are doubling down on efforts to craft a bipartisan infrastructure spending package, with House Democrats expected to bring a bill to vote as early as Wednesday.