[clang] [clang-repl] Allow private type aliases in out-of-line member function return types (PR #178842)

[Vassil Vassilev via cfe-commits]

vgvassilev wrote:

I'd prefer the commit message to have a 72-char title summarizing the change and the fixes clauses to come the very last items of the commit log.

https://github.com/llvm/llvm-project/pull/178842