The chip stock rally has been one of the most powerful moves in recent memory. The Philadelphia Semiconductor Index ran for 18 straight sessions before pulling back on April 28, its longest winning streak ever. During that run, the index jumped more than 47%, according to CNBC. Jim Cramer is looking at those numbers and seeing something that worries him. Not because the gains are wrong, but because of what happens when a trade gets this crowded this fast. What Cramer said on Mad Money "Lately, we've be ...