[eigen] <xxx>PivLU::solve( diagonal matrices )

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   The <xxx>PivLU::solve() member seems to be implemented only for MatrixBase 
descendants. My PDE solver code requires calling solve on a diagonal matrix. 
One way I can think of achieving this is to call <xxx>PivLU::inverse() * 
diag-matrix. Is there a better way to achieve this?

   Would an implementation of solve for DiagonalBase<> descendants as args be 
desirable, esp. since the argument is passed as const& ?


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