AMDGPU: Fix tracking subreg defs when folding through reg_sequence#140608

arsenm merged 2 commits intomainllvm/llvm-project:mainfrom

users/arsenm/issue139317/fix-subreg-of-immediate-tracking-through-reg-sequencellvm/llvm-project:users/arsenm/issue139317/fix-subreg-of-immediate-tracking-through-reg-sequenceCopy head branch name to clipboard