- User tagged pointers support (top 8-bit of user pointers automatically

  ignored by the CPU).
- Kernel mode NEON (no users for arm64 yet but work in progress).
- arm64 kernel Image header extended to accommodate future EFI stub.
- Remove BogoMIPS reporting (not relevant, it's just the timer
  frequency).
- Clean-up (EM_AARCH64/EM_ARM to elf-em.h, ELF notes in read-only
  segment, unused variable).
- Bug-fixes (RAM boundaries not 2MB aligned, perf, includes).
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