Derived-type components that have the `ALLOCATABLE` or `POINTER`
attribute as well as the CUDA `MANAGED` or `UNIFIED` attribute need to
have a specific allocator index set in the descriptor so the allocation
is done correctly. Without this, the allocation is done in host memory
and will trigger illegal read or write if the component is used on the
device. The correct allocator index was set some time ago for the
`DEVICE` attribute but the `MANAGED` and `UNIFIED` attribute need the
same mechanism.
Since the `Component::Genre` has quite some room I opted to add specific
genre for allocatable and pointer with both managed or unified
attribute.
@klausler Let me know if you would prefer another solution. I was
thinking about a separate field but I wanted to avoid wasting some
bytes.
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