[CUSOLVER] Avoid the conversion to CSR format for reordering routines #1786
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…JuliaGPU#1786) - index is now an optional argument for reordering routines; - we don't need to convert CSC matrices into CSR matrices anymore because reordering routines are based on the pattern of A + A'; - `zfd` now returns a column permutation for `SparseMatrixCSC`. This change makes sense because the CUSOLVER routine `csrzfd` computes a row permutation for sparse matrices in CSR format.
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zfdnow returns a column permutation forSparseMatrixCSC. This change makes sense because the CUSOLVER routinecsrzfdcomputes a row permutation for sparse matrices in CSR format.