[LTO] Turn ImportListsTy into a proper class (NFC)#106427

kazutakahirata merged 1 commit intollvm:mainllvm/llvm-project:mainfrom

kazutakahirata:cleanup_thinlto_ImportMapTy_ImportListsTy_classkazutakahirata/llvm-project:cleanup_thinlto_ImportMapTy_ImportListsTy_classCopy head branch name to clipboard