Extending Clang API Notes for C++: Overload-Specific Annotations for Ordinary Methods

This project extends Clang API Notes to support overload-specific annotations for C++ member functions. Today, API Notes cannot distinguish between overloaded methods such as foo(int) and foo(double), so annotations are applied to all overloads with the same name rather than to a specific function. The project introduces overload-aware matching for C++ methods, allowing API Notes to target individual overloads based on their parameter types while preserving compatibility with existing notes. This enables more precise annotations and improves interoperability for real-world C++ APIs, such as Swift bindings. The core deliverable is a working and tested implementation for explicit-parameter overloads (Phase 1), including typed-vs-legacy handling and regression tests. The project then extends this to support const- and ref-qualified member functions (Phase 2), completing support for receiver-sensitive overloads.