Handle ambiguous AST nodes.

(cherry picked from commit dbffec2cca)

src/plugins/cpptools/cppfindreferences.cpp

@@ -417,6 +417,24 @@ protected:
         return false;
     }
 
+    virtual bool visit(ExpressionOrDeclarationStatementAST *ast)
+    {
+        accept(ast->declaration);
+        return false;
+    }
+
+    virtual bool visit(FunctionDeclaratorAST *ast)
+    {
+        accept(ast->parameters);
+
+        for (SpecifierAST *spec = ast->cv_qualifier_seq; spec; spec = spec->next)
+            accept(spec);
+
+        accept(ast->exception_specification);
+
+        return false;
+    }
+
 private:
     QFutureInterface<Utils::FileSearchResult> *_future;
     Identifier *_id; // ### remove me