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

[Matt Arsenault via llvm-commits]

arsenm wrote:


> 
> The runtime doesn't split the dispatch into machine-sized chunks.  If it does have a limit, then it is probably much larger than we want to allocate for.
> 

I thought it already had to do this if stack was enabled to avoid going over a device wide limit

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