[llvm] [AMDGPU] Correctly merge noalias scopes during lowering of LDS data. (PR #131664)

[Jon Chesterfield via llvm-commits]

JonChesterfield wrote:

The premise is reasonable - the aliasing information in lds lowering might be suboptimal.

The variables all go in different slots of a struct though so no lds variables alias any other, outside of the externally allocated hack thing where all of them alias every other externally allocated one. So I'm a little confused how more elaborate aliasing information helps.

https://github.com/llvm/llvm-project/pull/131664