Add specialized operators for ArrayPortalValueReference
The ArrayPortalValueReference is supposed to behave just like the value it encapsulates and does so by automatically converting to the base type when necessary. However, when it is possible to convert that to something else, it is possible to get errors about ambiguous overloads. To avoid these, add specialized versions of the operators to specify which ones should be used. Also consolidated the CUDA version of an ArrayPortalValueReference to the standard one. The two implementations were equivalent and we would like changes to apply to both.
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