handle clusters (alternative) - #287
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The function 'amdgpu_used_lanes_count' in amdgpu-tdep.c and the function 'lane_workgroup_pos' in amd-dbgapi-target.c both compute partial workgroup sizes the same way. Extract the common code into a function named 'partial_workgroup_sizes' and reuse. This is a refactoring with no behavioral change.
Starting with gfx1250, workgroups may be organized into clusters, giving a workitem -> wave -> workgroup -> cluster -> grid hierarchy. Handle clusters by taking them into account when calculating workitem/lane coordinates, when showing wave target ids, and in the "info dispatches" command.
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This is the same as PR #206, except that it uses the alternative dbgapi in PR ROCm/rocm-systems#10241.