[clang] Check the type of Objective-C++ instance variables in WebKit member variable checkers. (PR #127570)

[Ryosuke Niwa via cfe-commits]

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@@ -87,6 +92,31 @@ class RawPtrRefMemberChecker
     }
   }
 
+  void visitObjCDecl(const ObjCContainerDecl *CD) const {
+    if (auto *ID = dyn_cast<ObjCInterfaceDecl>(CD)) {
+      for (auto *Ivar : ID->ivars())
+        visitIvarDecl(CD, Ivar);
+      return;
+    }
+    if (auto *ID = dyn_cast<ObjCImplementationDecl>(CD)) {
+      for (auto *Ivar : ID->ivars())
+        visitIvarDecl(CD, Ivar);
+      return;
+    }
+  }
+
+  void visitIvarDecl(const ObjCContainerDecl *CD,
+                     const ObjCIvarDecl *Ivar) const {
+    const Type *IvarType = Ivar->getType().getTypePtrOrNull();
+    if (!IvarType)
+      return;
+    if (auto *IvarCXXRD = IvarType->getPointeeCXXRecordDecl()) {
----------------
rniwa wrote:

But again, we're doing a nullptr check here with if statement so I think we're 
good :)

https://github.com/llvm/llvm-project/pull/127570
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