x86 32-bit Changes Look To Be Ready For Linux 6.15 - Drops Support For More Than 4GB RAM

Over the past few months there's been an in-progress patch series by Arnd Bergmann for cleaning up the x86 32-bit kernel support for running on x86_64 CPUs. After the third iteration of the patches were posted this week, these x86 32-bit CPU clean-ups were shuffled into the tip/tip.git "x86/cpu" Git branch ahead of the upcoming Linux 6.15 merge window...