Fix cagra graph opt bug #2365
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Fix cagra graph opt bug #2365
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backport of rapidsai/cuvs#192
There is a bug in the current CAGRA graph rank-based neighbor reordering process. A low recall or illegal memory access can occur if there are many detourable nodes from a node to its neighbors, e.g. there is a small subgraph in the initial kNN graph. This PR fixes this.