[clang] [clang][CodeComplete] Use HeuristicResolver to resolve DependentNameTypes (PR #123818)

[Haojian Wu via cfe-commits]

hokein wrote:

Do we need a release note in llvm-project/clang/docs/ReleaseNotes.rst? This is an improvement on clang's code completion infra, but maybe it is not noticeable to compiler users.

https://github.com/llvm/llvm-project/pull/123818