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

[Mirko Brkušanin via cfe-commits]

mbrkusanin wrote:

> > We already have gfx11-generic. Do you mean gfx11-5-generic?
> 
> Based on the comment, the 115*s are covered by gfx11-generic. But the 117x aren't. Do we need a new gfx11-7-generic? (we also are missing one for gfx13)

'generic' targets are not used on graphics side as far as I know. All gfx117x targets are identical at the moment. If someone asks for a generic one we can add it.

gfx13 only has one subtarget at the moment.

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