Apple may report the first ever decline in iPhone shipments when it announces its quarterly results on Tuesday (postponed from Monday because of the memorial service for long time board member Bill Campbell). But the company still has unparalleled impact on the mobile supply chain, and any report of a new choice of component can send suppliers’ stocks soaring or falling – as Qualcomm, Samsung and LG discovered this week. Securities analyst Warren Lay of Maybank Kim Eng, and handset shipments tracker TrendForce, started the latest speculation that the iPhone is no longer invincible. It has endured slower growth in the past, as well as market jitters about lower levels of innovation, but Apple addressed many of the criticisms with…