[clang] [clang][msvc] Fix crash when mangling concept template arguments (PR #192951)

[Younan Zhang via cfe-commits]

https://github.com/zyn0217 requested changes to this pull request.

This seems to be an arbitrary fix for MS ABI.

I don't think we should diagnose anything about such uses before we can confirm this is a bug in clang or a spec issue of MS ABI.


https://github.com/llvm/llvm-project/pull/192951