6bafe65d28
Due to legacy reasons (`MEdge`), edge calculation was being done with idea that edges cannot be temporarily copied. But today, edges are just `int2`, so using `edge *` instead of `edge` actually made things worse. And since `OrderedEdge` itself is the same thing as `int2`, it does not make sense to use `Map` for edges. So, now edges are in a hash set. To be able to take index of edges, `VectorSet` is used. The only functional change now is that original edges will be reordered as well. This should be okay just like an unintentional but stable indices change. For 2'000 x 2'000 x 2'000 cube edges calculation, change is around `3703.47` -> `2911.18` ms. In order to reduce memory usage, a template parameter is added to `VectorSet` slots, so they can use a 32 instead of 64 bit index type. Without that, the performance change is not consistent and might not be better on a computer with more memory bandwidth. Co-authored-by: Hans Goudey <hans@blender.org> Pull Request: https://projects.blender.org/blender/blender/pulls/120224
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