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This PR adds an initial implementation for the map modifiers close, present and ompx_hold, primarily just required adding the appropriate map type flags to the map type bits. In the case of ompx_hold it required adding the map type to the OpenMP dialect. Close has a bit of a problem when utilised with the ALWAYS map type on descriptors, so it is likely we'll have to make sure close and always are not applied to the descriptor simultaneously in the future when we apply always to the descriptors to facilitate movement of descriptor information to device for consistency, however, we may find an alternative to this with further investigation. For the moment, it is a TODO/Note to keep track of it.