[clang] [Clang] [Sema] Added a check for `NameInfo` actually containing a valid destructor name (PR #210610)

[Soham Karandikar via cfe-commits]

skadewdl3 wrote:

@cor3ntin I've added a lit test in `clang/test/SemaTemplate/friend.cpp`. I believe that's the right place, though I might be wrong.

https://github.com/llvm/llvm-project/pull/210610