[clang] [Clang][Parser] Fix crash of clang when using C++ constructs like :: in C code (PR #74926)

[Shafik Yaghmour via cfe-commits]

https://github.com/shafik approved this pull request.

If you have addressed all review comments and no one has asked you to wait to land the PR then you can land once you get an approval.

https://github.com/llvm/llvm-project/pull/74926