Solve using a sparse LDL^T factorization.

::

 ldl_solve(DM b, DM D, DM LT, [int] p) -> DM
 ldl_solve(SX b, SX D, SX LT, [int] p) -> SX

Extra doc: https://github.com/casadi/casadi/wiki/L_18x

Doc source: https://github.com/casadi/casadi/blob/develop/casadi/core/matrix_decl.hpp#L582

Implementation: https://github.com/casadi/casadi/blob/develop/casadi/core/matrix_decl.hpp#L582-L585

To edit, see writing tips.