Handling Devices Duplicated via Multiple Adapters

[alycm]

If a single hardware device is supported by multiple adapters, e.g. a GPU supporting Level Zero and OpenCL, then it could be enumerated multiple times.

Should such duplicates be filtered out so that a hardware device is only presented once, but if so how to prioritise which adapter to expose?

Should such duplicates be left and let the language runtime about handle it using UUIDs?

[kbenzie]

Possibly related to ONEAPI_DEVICE_SELECTOR #220

[alycm]

WG call discussion: Unified runtime should report everything it sees, even if that means reporting one device more than more. Higher levels handle it (or not).