[NVPTX] extend type support for nvvm.{min,max,mulhi,sad} (#78385)

Ensure intrinsics and auto-upgrades support i16, i32, and i64 for for
`nvvm.{min,max,mulhi,sad}`

- `nvvm.min` and `nvvm.max`: These are auto-upgraded to `select`
instructions but it is still nice to support the 16 bit variants just in
case any generators of IR are still trying to use these intrinsics.
- `nvvm.sad` added both the 16 and 64 bit variants, also marked this
instruction as speculateble. These directly correspond to the PTX
`sad.{u16,s16,u64,s64}` instructions.
- `nvvm.mulhi` added the 16 bit variants. These directly correspond to
the PTX `mul.hi.{s,u}16` instructions.