[clang] Fix WebKit static analyzers to support ref and deref methods to be defined on different classes. (PR #69985)

[Artem Dergachev via cfe-commits]

haoNoQ wrote:

(You still need me to merge right? You can ask me to merge, or you can address nitpicks and then ask me to merge, or you can go through https://llvm.org/docs/DeveloperPolicy.html#obtaining-commit-access and merge yourself!)

https://github.com/llvm/llvm-project/pull/69985