[SYCL]Allow parameter pack expansion in device_has attribute

[elizabethandrews]

No description provided.

[premanandrao]

LGTM!

Adding @AaronBallman to check if he can suggest some other variants for testing pack expansion.

[Alexander-Kleymenov]

Hello, thank you for the update! At what compiler build device_has support for variadic args will be available?

[elizabethandrews]

LGTM!

Adding @AaronBallman to check if he can suggest some other variants for testing pack expansion.

I would be happy to add additional tests if there are any but this patch essentially just uses existing TableGen interface for pack expansion arguments. So most likely whatever currently works for other attributes which accept pack expansions will work here and if something does not work, it probably warrants follow-up work beyond the scope of this PR.

[elizabethandrews]

Hello, thank you for the update! At what compiler build device_has support for variadic args will be available?

@Alexander-Kleymenov I will reach out to you via email!

[AaronBallman]

LGTM as well; I don't think there's a need for additional pack expansion testing as part of this patch (I think the coverage is reasonable enough through other attributes, this is just extending the list of attributes using the functionality).

[elizabethandrews]

Thanks for the reviews everyone!

@intel/llvm-gatekeepers PR is ready for merge. The failing testing looks infrastructure related.

[AlexeySachkov]

  Failed Tests (1):
    SYCL :: SubGroup/shuffle_fp64.cpp

This is a known issue on CUDA. ESIMD emulator tests passed, but the job reported failure to upload some results somewhere, so it should be ok to merge anyway