[llvm] [AMDGPU][LowerModuleLDS] Refactor partially lowered module detection (PR #85793)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> @arsenm did we ever get a reasonable place in tree for runtime tests? As in a bunch of programs written in C++ (ideally) or HIP/opencl (if one must) for things like this?

This is permanently stuck in "coming soon". There seems to be a fragment of HIP support in llvm-test-suite, but last I tried to use it I couldn't get it to build. It seemed to have odd expectations for how to find rocm 

https://github.com/llvm/llvm-project/pull/85793