* Data shows central bank policy largely neutral (Adds details, economists’ comments) BEIJING, May 12 (Reuters) – China’s new bank lending and total social financing weakened in April, but money supply growth picked up slightly, indicating the central bank is treading cautiously in steering policy to support the slowing economy. Chinese banks made 774.7 billion yuan ($124.39 billion) worth of new yuan loans in April, lower than a forecast of 880 billion yuan in a Reuters poll and below than the previous month’s 1.05 trillion yuan, central bank data showed on Monday.