[clang] [lldb] [Clang] Improve Sema diagnostic performance for __builtin_counted_by_ref (PR #116719)

[Bill Wendling via cfe-commits]

================
@@ -14690,6 +14690,14 @@ void Sema::FinalizeDeclaration(Decl *ThisDecl) {
     }
   }
 
+  // The result of __builtin_counted_by_ref cannot be assigned to a variable.
+  // It allows leaking and modification of bounds safety information.
+  if (const auto *CE = dyn_cast_if_present<CallExpr>(VD->getInit());
+      CE && CE->getBuiltinCallee() == Builtin::BI__builtin_counted_by_ref)
----------------
bwendling wrote:

Done.

https://github.com/llvm/llvm-project/pull/116719