[llvm] [AMDGPU] Add target hook to isGlobalMemoryObject (PR #112781)

[Jeffrey Byrnes via llvm-commits]

https://github.com/jrbyrnes approved this pull request.

The latest changes to IGLP / GCNSched still look fine. I prefer the TII hook over the DAG hook. Maybe wait a little while to see if there are any serious objections with the latest approach.

https://github.com/llvm/llvm-project/pull/112781