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

[Artem Belevich via llvm-commits]

Artem-B wrote:

> Can we fix it forward? I'll prepare a patch.

The fix itself should be simple (tablegen pattern converting bitcast to a proxyreg?) but we'll also need tests. Should be doable, but I don't know @gribozavr 's time constraints.



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