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Make RuntimeDeviceTracker DeepyCopy more efficient.

Robert Maynard requested to merge robertmaynard/vtk-m:decrease_cost_of_runtime_tracker_deep_copy into master

The DeepCopy method is used when a ScopedGlobalRuntimeDeviceTracker is constructed. This in turn causes the rebuilding of the device names and states which isn't a free operation. Now we copy the already computed information.

This was noticeable when using ArrayHandleTransform since it uses ScopedGlobalRuntimeDeviceTracker when construction host side portals.

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