[Plasma] Several GPU-related APIs are used in places where errors cannot be appropriately handled

[asfimport]

I'm adding DCHECK_OK statements for ARROW-2883 to fix the unchecked Status warnings, but this code should be refactored so that these errors can bubble up properly

Reporter: Wes McKinney / @wesm

_{Note: This issue was originally created as ARROW-2888. Please see the migration documentation for further details.}

[asfimport]

Wes McKinney / @wesm:
Plasma CUDA support is as yet experimental, but it would be a good idea to fix these at some point