[clang-tools-extra] [clangd] Avoid crash on pseudo-destructor selection (PR #195939)

[Yanzuo Liu via cfe-commits]

zwuis wrote:

I'm surprised that the NamedTypeInfo is null. AFAIK there should be a `DecltypeTypeLoc`. I don't think this is the best approach.

> clangd crashes during textDocument/codeAction on malformed pseudo-destructor expressions like y->~decltype(A())(). ...

This expression is VALID.

https://github.com/llvm/llvm-project/pull/195939