[NVPTX] Plans to support s16x2/u16x2 instructions for sm_90

On hopper (sm_90) some instructions (add, min, max) support s16x2/u16x2 type. Is this something someone is planning to add in the near future?

@Artem-B do you have a plan for those?

I sent a PR to add support:

Any help reviewing it would be great.