[REVIEW] Fix padding assertion in sparse Gram evaluation #1521
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A assertion could fail if the result kernel matrix is column major but has only a single row. In this case the old implementation identified the matrix as row major instead and the following stride-check failed.
Now the check is extended to identify both layouts. The only case where it cannot be exactly determined is a 1x1 matrix in which the following code just picks column major as default.
CC @cjnolet @tfeher