Add the builtin to copy variadic lists/arguments.
Signed-off-by: Maximilian Brune <maximilian.brune@9elements.com>
Change-Id: I4507b901bdce052c5d1701fdf825eb8a96a5b55a
Reviewed-on: https://review.coreboot.org/c/coreboot/+/77097
Reviewed-by: Martin L Roth <gaumless@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>