A single regression fix for x86: Moving the invocation of arch_cpu_finalize_init() earlier in the boot process caused a boot regression on IBT enabled system. The root cause is not the move of arch_cpu_finalize_init() itself. The system fails to boot because the subsequent efi_enter_virtual_mode() code has a non-IBT safe EFI call inside. This was never noticed because IBT was enabled after the EFI initialization. Switching the EFI call to use the IBT safe wrapper cures the problem.