[clang] [llvm] [AMDGPU] Define new target gfx1154 (PR #204816)

[Mirko Brkušanin via cfe-commits]

mbrkusanin wrote:

> Do we need a point in release note?

Looking through git logs, new targets are rarely mentioned (I was only able to find gfx950 and gfx1310). Should we add it?

> Are we going to get gfx11 generic targets

We already have gfx11-generic. Do you mean gfx11-5-generic?

https://github.com/llvm/llvm-project/pull/204816