This company hasn't made its debut on the weight-loss market yet, but it may.Watch out, Novo Nordisk and Eli Lilly. Per some new clinical-trial data it published on July 17, the massive Swiss pharmaceutical company Roche Holding (RHHBY 0.32%) might have a winning weight-loss pill on its hands. But is it reasonable to expect the stock to perform well enough to warrant buying? Let's investigate.This pill has the makings of a sizzlerFirst things first. Appreciate that Roche's weight-loss pill program is curren ...