Intel and Advanced Micro Devices on Tuesday said they are forming a group to help make sure software works across their chips, responding to a rising challenge from Arm Holdings. Intel invented what is known as the x86 computing architecture, a technology that for 40 years has powered the world's laptops, PCs and data center servers. AMD licenses the technology from Intel and also makes chips using x86, competing directly against Intel under a longstanding legal settlement. But the market share