[llvm] [AMDGPU][MC] GFX9 - allow op_sel in v_interp_p2_f16 (PR #150712)

[Joe Nash via llvm-commits]

https://github.com/Sisyph commented:

Can you please add a few assembly tests with 3 values in op_sel? like '... op_sel:[1,0,1]

With that LGTM

https://github.com/llvm/llvm-project/pull/150712