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The majority of subset ops operate on hyperrectangular subsets. This commit adds a new optional interface method (`getAccessedHyperrectangularSlice`) that can be implemented by such subset ops. If implemented, the other `operatesOn...` interface methods of the `SubsetOpInterface` do not have to be implemented anymore. The comparison logic for hyperrectangular subsets (is disjoint/equivalent) is implemented with `ValueBoundsOpInterface`. This makes the subset hoisting more powerful: simple cases where two different SSA values always have the same runtime value can now be supported.