[llvm] [AMDGPU][MC] Disallow op_sel in v_dot4 and v_dot8 with 4- or 8-bit packed data (PR #100485)

[Jun Wang via llvm-commits]

jwanggit86 wrote:





> and I think the older targets did support op_sel with these.

These instructions (v_dot4, v_dot8) have fixed ways of using the 4-bit/8-bit data, so op_sel isn't really meaningful?

https://github.com/llvm/llvm-project/pull/100485