[llvm] [AMDGPU][True16][MC] Support v_swap_b16. (PR #100442)

[Brox Chen via llvm-commits]

broxigarchen wrote:

> Can you please split this into one patch which just adds MC (assembler/disassembler) support and tests, and then a second patch which adds CodeGen support and tests?

Thanks for the comment! Just trim the patch to contain only MC changes

https://github.com/llvm/llvm-project/pull/100442