[llvm] [NVPTX] Make i16x2 a native type and add supported vec instructions (PR #65432)

[Artem Belevich via llvm-commits]

https://github.com/Artem-B commented:

Thank you for the patch.
It looks fine in general. One thing I'd suggest is to extract generic tablegen changes (adding specific parameter types) into a separate patch so they do not clutter the v2i16 changes.

https://github.com/llvm/llvm-project/pull/65432