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Add a way to see all possible values for `-fsycl-targets` flag
Is your feature request related to a problem? Please describe
This is split from #1191 where folks were confused about which targets are supported by our SYCL implementation and which spelling should be used for them, i.e. what are the possible values for -fsycl-target compiler flag?
Describe the solution you would like
There is no proposal for this yet and the solution/interface should be developed as part of this issue. Original issue mentioned -fsycl-targets=list as an example of how it could be used. Displaying the full list under --help is also an option
Describe alternatives you have considered
No response
Additional context
No response