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

[Vitaly Buka via llvm-commits]

vitalybuka wrote:

There are still broken bots:
https://lab.llvm.org/buildbot/#/builders/52
https://lab.llvm.org/buildbot/#/builders/24/builds/8265
https://lab.llvm.org/buildbot/#/builders/169/builds/11275


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