mi: drop unused overlay code
It doesn't seem to be used anywhere for quite some time.
According to history, it once was used by Nvidia.
@aplattner could you please check whether it's still in use by your driver ?
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It doesn't seem to be used anywhere for quite some time.
According to history, it once was used by Nvidia.
@aplattner could you please check whether it's still in use by your driver ?