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

[Jon Chesterfield via llvm-commits]

JonChesterfield wrote:

Alright, this might be useful for sanitizer workloads but it looks broken top me.

Please put a loop in the start of the pass that checks whether the module has any sanitizer things in it (function attribute iirc?) and immediate returns without changing the IR at all if there are no uses of the sanitizer. Provided it is clear that this does not execute on any non-sanitizer IR I'm happy to hit the green button.

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