[llvm] [X86] Add AMD Llano family detection (PR #111312)

[Aiden Grossman via llvm-commits]

https://github.com/boomanaiden154 requested changes to this pull request.

This patch needs to be mirrored in `compiler-rt/lib/builtins/cpu_model/x86.c`.

https://github.com/llvm/llvm-project/pull/111312