[llvm] [AMDGPU][LTO] Introduce AMDGPUCloneModuleLDS (PR #89683)

[Anshil Gandhi via llvm-commits]

gandhi56 wrote:

> I'm not sure what the relation is between this and #89245

This pass runs before (AMDGPU)SplitModule. Since every kernel will have its own specific LDS global struct, SplitModule should be able to form self-contained modules with comparatively fewer cross-module LDS references.

https://github.com/llvm/llvm-project/pull/89683