[llvm] [AMDGPU][Scheduler] Refactor ArchVGPR rematerialization during scheduling (PR #125885)

[Hubert Tong via llvm-commits]

hubert-reinterpretcast wrote:

> Is this not the same issue solved by [382a085](https://github.com/llvm/llvm-project/commit/382a085a95b0abeac77b150b7b644b372bd08e78) and reported by a different builder that checked out LLVM at my commit (before the fix) each time?

Sorry. I missed that the fix happened here: https://github.com/llvm/llvm-project/pull/125885#issuecomment-2862933136

https://github.com/llvm/llvm-project/pull/125885