[clang] [llvm] [AMDGPU] Introduce GFX9/10.1/10.3/11 Generic Targets (PR #76955)

[Pierre van Houtryve via llvm-commits]

Pierre-vh wrote:

> mad_mix

I added run lines to `mad-mix.ll` and it behaves as expected: no fma/mad_mix emitted

https://github.com/llvm/llvm-project/pull/76955