aco: Make a better guess at which instructions need the VCC hint
Instead of blindly adding the VCC hint all the time in bool_to_vector_condition, only add this hint when the result is actually used by a v_cndmask instruction.
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Instead of blindly adding the VCC hint all the time in bool_to_vector_condition, only add this hint when the result is actually used by a v_cndmask instruction.