Remember about two years ago, when absolutely everyone wanted to either upgrade their existing PC or buy a new one? Yeah, that doesn’t appear to be the case anymore, according to the latest market report from Mercury Research. The report states that x86 chip shipments have dropped by the largest percentage year-over-year since the report began way back in 1994. Analyst Dean McCarron says it’s probably the largest decline since the precipitous downturn of 1984. “Desktop and mobile client CPU shipments were down significantly compared to a year ago, with desktop CPU unit shipments falling to the…