Merge branch 'cherry-pick-be325ec0' into 'releases/2.9'

Merge branch 'issue/fill-sequential-information' into 'master'

See merge request !506

dune/istl/paamg/pinfo.hh

@@ -71,17 +71,15 @@ namespace Dune
       {}
 
       template<class T1, class T2>
-      void dot (const T1&, const T1&, T2&) const
+      void dot (const T1& x, const T1& y, T2& result) const
       {
-        // This function should never be called
-        std::abort();
+        result = x.dot(y);
       }
 
       template<class T1>
-      typename FieldTraits<typename T1::field_type>::real_type norm (const T1&) const
+      typename FieldTraits<typename T1::field_type>::real_type norm (const T1& x) const
       {
-        // This function should never be called
-        std::abort();
+        return x.two_norm();
       }
 
       template<class T>