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Allow ArrayHandleTransform to work with ExecObject

Kenneth Moreland requested to merge kmorel/vtk-m:array-handle-transform-exec-object-2 into master

This change allows you to set a subclass of vtkm::cont::ExecutionObjectBase as a functor used in ArrayHandleTransform. This latter class will then detect that the functor is an ExecObject and will call PrepareForExecution with the appropriate device to get the actual Functor object.

This change allows you to use virtual objects and other device dependent objects as functors for ArrayHandleTransform without knowing a priori what device the portal will be used on.

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