[AMDGPU][SIInsertWaitCnts] Use RegUnits-based tracking#162077

Pierre-vh wants to merge 1 commit intomainllvm/llvm-project:mainfrom

users/pierre-vh/refactor-insertwaitcnt-regunitsllvm/llvm-project:users/pierre-vh/refactor-insertwaitcnt-regunitsCopy head branch name to clipboard