[llvm] [AMDGPU] Introduce "amdgpu-sw-lower-lds" pass to lower LDS accesses to use device global memory. (PR #87265)

[Pierre van Houtryve via llvm-commits]

https://github.com/Pierre-vh commented:

mostly coding style nits. The coding style here differs a bit from what we usually see so I pointed out the things that stood out to me as someone that's not in the loop with this change.

https://github.com/llvm/llvm-project/pull/87265