[AMDGPU][Scheduler] Use `AMDGPU::NoSubRegister` instead of 0 (NFC)#150610

lucas-rami merged 1 commit intollvm:mainllvm/llvm-project:mainfrom

lucas-rami:remat-use-nosubregsiter-cstlucas-rami/llvm-project:remat-use-nosubregsiter-cstCopy head branch name to clipboard