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

[Nathan Ridge via cfe-commits]

HighCommander4 wrote:

Thanks for the reviews!

> 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.

I added a generic note about using `HeuristicResolver` to improve code completion results in dependent code.

I think adding a separate note for individual changes to use `HeuristicResolver` in code completion are likely to be too much detail.

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