[ORC] Make ElementSet, ContainerElementsMap inner classes. (#184955) ElementSet and ContainerElementsMap were type aliases inside WaitingOnGraph. This commit replaces the aliases with classes deriving from DenseSet and DenseMap, with convenience operations added for WaitingOnGraph (merge, remove, remove_if, and visit). These convenience functions are used to simplify the implementation of various parts of WaitingOnGraph. Unit tests are added for the convenience operations to improve test coverage. In addition to improving readability of the main WaitingOnGraph operations, this will make it easier to experiment with other underlying representations for these types (e.g. sorted vectors).
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