(Reuters) - Chipmaker Texas Instruments reported better-than-expected first-quarter profit and revenue on Tuesday, offering hope that a slowdown in demand for microchips late last year may not be as long-lasting as feared.The company, which makes a broad variety of chips that go into many devices, also forecast strong second-quarter revenue and profit, sending its shares up over 5 percent after the bell.Chipmakers have been struggling with declining demand for chips from China as its economy..