Improve Symbolic Cholesky performance #1758
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This improves the symbolic Cholesky performance by preprocessing the matrix on the GPU with a Minimum Spanning Tree algorithm.
Example rgg_22 from SuiteSparse with METIS nested dissection on H100:
The performance improvements are split between device-host transfer (transferring a spanning tree instead of the full matrix) and the elimination tree computation (operating on a sparser graph)