[llvm] [AMDGPU] New GFX11+ aliases v_dot4_i32_i8 and v_dot8_i32_i4 (PR #118997)

[Stanislav Mekhanoshin via llvm-commits]

https://github.com/rampitec approved this pull request.

That's always a bad idea to repurpose instructions' names, but it is already done. LGTM for the purpose of SP3 compatibility.

https://github.com/llvm/llvm-project/pull/118997