By David Randall NEW YORK (Reuters) – Investors suffering through a bruising year for markets are hoping that recent signs of wobbling economic growth will force the Federal Reserve and other global central banks to take their foot off the gas in the fight against inflation, sparking sharp rebounds in stocks and bonds. The S&P 500 is up 5% over the last two days, following a brutal September in which it fell 9.3% alongside declines in other global equity benchmarks. Yields on U.S. Treasuries, which move inversely to prices, have plummeted by nearly 35 basis points in October from multi-year hi…