[llvm] [MachineScheduler] Fix physreg dependencies of ExitSU (PR #123541)

[Sergei Barannikov via llvm-commits]

s-barannikov wrote:

Some AMDGPU tests will need to be updated manually. I'll do that in a separate commit as I'm not sure I can do it correctly.


https://github.com/llvm/llvm-project/pull/123541