[clang-tools-extra] [clangd] [HeuristicResolver] Protect against infinite recursion on DependentNameTypes (PR #83542)

[Younan Zhang via cfe-commits]

zyn0217 wrote:

Great example, thanks! Now I understand the "two-level" case better.

I don't have any other concerns about the refactor, so feel free to land it or wait for other folks' opinions.

https://github.com/llvm/llvm-project/pull/83542