[eigen] Efficient way to store symmetric matrix for use with Cholesky?

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   Right now I am using a full square matrix to store a symmetric matrix and 
am calling LDLT on it. I believe a bug was recently fixed that gets the 
Cholesky module accessing only one triangular part of the matrix, as it 
should. Is there some way to just store one triangular part and call LDLT on 
that instead of storing the entire matrix?


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