turnip/a660: dEQP-VK.spirv_assembly.instruction.terminate_invocation.terminate.subgroup_ballot failure due to "movmsk" reordered with "kill"

It seems that movmsk produced from ballot(true) could be reordered with kill in ir3_sched.

This causes the failure of dEQP-VK.spirv_assembly.instruction.terminate_invocation.terminate.subgroup_ballot on a660.

Looking at ir3_sched I'm not sure how to prevent this.