[clang] [alpha.webkit.UncountedCallArgsChecker] Add support for Objective-C++ property access (PR #108669)

[Ryosuke Niwa via cfe-commits]

rniwa wrote:

> I'm also somewhat terrified of returning C++ objects from ObjC methods by value, ever since I learned that when you call an ObjC method on a nil it returns a _zero-initialized_ object without calling a constructor on it.

Yikes. I didn't know that!

https://github.com/llvm/llvm-project/pull/108669