[clang] [WebKit checkers] Treat passing of a member variable which is capable of CheckedPtr as safe. (PR #142485)

[Ziqing Luo via cfe-commits]

================
@@ -32,6 +32,22 @@ static void baz() {
 
 } // namespace call_args_checked
 
+namespace call_args_member {
+
+void consume(CheckedObj&);
+
+struct WrapperObj {
+  CheckedObj checked;
+  CheckedObj& checkedRef;
+  void foo() {
+    consume(checked);
----------------
ziqingluo-90 wrote:

do you need to check that the `checked` expr here is in fact `this->checked`?
In other words, is the example below valid?
```
struct WrapperObj {
  CheckedObj checked;

  void foo(WrapperObj *WO) {
    consume(WO->checked); // I see no warn here                               
  }
};
```

https://github.com/llvm/llvm-project/pull/142485