The XSAVE area can be quite large (1-2KB+), so rather than always
putting it on the kernel stack, just use the arch_thread FPU state.
Change-Id: Ie64c3ea3ca52cd8a4425ae1da69792588a69832a
Reviewed-on: https://review.haiku-os.org/c/haiku/+/9090
Reviewed-by: Jérôme Duval <[email protected]>
Reviewed-by: waddlesplash <[email protected]>
Tested-by: Commit checker robot <[email protected]>