Ignore row/column blocks structure when using dynamic sparsity

The row/column blocks can be huge when using dynamic sparsity. This
can result in very large memory usage when augmenting the jacobian
with the LM diagonal.

Thanks to Mingsong Dou for reporting this.

Change-Id: I6aa140ceefa98389ae17958f89ca76e0c76f95b8
1 file changed