[eigen] Blocks and dynamic stack matrices

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Hi guys,

I am getting a run-time assert when calling ::row on a Matrix<double,
Dynamic, Dynamic, 1, 3, 3>.

The assert is caused by the check in lines 291-293 of Block.h and the
issue is that BlockRows!=XprType::RowsAtCompileTime but
BlockRows==XprType::MaxRowsAtCompileTime. Changing the assert to

      eigen_assert( (i>=0) && (
          ((BlockRows==1) &&
&& i<xpr.rows())
&& (BlockCols==1) && i<xpr.cols())));

fixes the problem.

Does anybody see an issue with doing this globally in Block.h?

- Hauke

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