[llvm] [RegisterScavenging] Respect early-clobber when scavenging registers (PR #184814)

[Dominik Steenken via llvm-commits]

dominik-steenken wrote:

> Thanks for getting rid of the AMDGPU changes! I think this does what it says, but I'm not very familiar with System Z, so it would be good to also get a review from someone that is.

Thank you for your review! I have incorporated all of your comments.

https://github.com/llvm/llvm-project/pull/184814