[GPU] Add workgroup/subgroup scope specification to mma attr interface #18548
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Signed-off-by: Max Dawkins <max.dawkins@gmail.com>
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The new DataTiledMMAAttr represents the workload of a full workgroup, while the regular MMAAttr represents the workload of a single subgroup. The scope of the workload is needed when distributing multi_mma ops to threads/lanes.
This PR adds an interface function to the MMAAttr interface to return the scope of the attribute's workload, as a new
IREE::GPU::MMAScopeenum. The data tiled attribute returnsIREE::GPU::MMAScope::Workgroup, and the normal MMAAttr returnsIREE::GPU::MMAScope:Subgroup.