[Clang] Revert "Reject auto combined with type specifiers in C++ (#208552)" and follow-ups commits - #215320

[Clang] Revert "Reject auto combined with type specifiers in C++ (#208552)" and follow-ups commits#215320

to268 merged 11 commits into

llvm:mainllvm/llvm-project:mainfrom

to268:revert-auto-ts-cxx-commitsto268/llvm-project:revert-auto-ts-cxx-commitsCopy head branch name to clipboard