cpus: Change cpu_thread_is_idle() argument to CPUState It no longer needs CPUArchState. Prepares for changing all_cpu_threads_idle() CPU loop to CPUState and needed for changing qemu_kvm_wait_io_event() argument to CPUState. Reviewed-by: Richard Henderson <rth@twiddle.net> Signed-off-by: Andreas Färber <afaerber@suse.de>