[d3d12] get vertex_index & instance_index builtins working for indirect draws
          #7535
        
          
      
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Connections
Closes #2471
Description
Gets the
vertex_index&instance_indexbuiltins working for indirect draws by updating the existing root constants (using the validation shader; same strategy as in #5730).Testing
Existing
wgpu_gpu::vertex_indicestest.Squash or Rebase?
Rebase