[clang] [clang] Mark labels referenced when used in named break or continue (PR #166033)

[via cfe-commits]

================
@@ -3281,6 +3281,10 @@ static Scope *FindLabeledBreakContinueScope(Sema &S, Scope *CurScope,
                                             SourceLocation LabelLoc,
                                             bool IsContinue) {
   assert(Target && "not a named break/continue?");
+
+  S.MarkAnyDeclReferenced(Target->getLocation(), Target,
+                          /*MightBeOdrUse=*/false);
----------------
Sirraide wrote:

```suggestion
  Target->markUsed(S.Context);
```

https://github.com/llvm/llvm-project/pull/166033