James Manyika, an SVP at Google-Alphabet and an AI researcher, said Silicon Valley executives have worried Americans by talking about 'wiping out 50% of jobs.'Bloomberg/Getty ImagesA Google executive said he'd bet that AI will not lead to mass layoffs.SVP James Manyika said AI will eliminate some jobs, create others, and change many more.He joins other tech executives pushing back on AI job-loss fears as public skepticism grows.Will AI crush the…