[clang] Nameof operator (PR #104777)

[via cfe-commits]

Sirraide wrote:

> I am personally not convinced we should add introspective facilities specifically for C++ at this point given we will most likely start implementing reflections within the next 6 months

Yeah, especially since converting enumerator values to a name is one of the more commonly mentioned use cases for reflexion.

https://github.com/llvm/llvm-project/pull/104777