add explicit instanciations to looptest to reduce compile time

dune/common/simd/test/looptest.hh.in

@@ -14,6 +14,10 @@ namespace Dune {
 #cmake @template POINT@
     extern template void
     UnitTest::check@POINT@<LoopSIMD<@SCALAR@, 5> >();
+    extern template void
+    UnitTest::check@POINT@<LoopSIMD<@SCALAR@, 5, 64> >();
+    extern template void
+    UnitTest::check@POINT@<LoopSIMD<LoopSIMD<@SCALAR@, 2>, 5> >();
 #cmake @endtemplate@
 
   } //namespace Simd

dune/common/simd/test/looptest_vector.cc.in

@@ -8,6 +8,8 @@ namespace Dune {
   namespace Simd {
 
     template void UnitTest::check@POINT@<LoopSIMD<@SCALAR@, 5> >();
+    template void UnitTest::check@POINT@<LoopSIMD<@SCALAR@, 5, 64> >();
+    template void UnitTest::check@POINT@<LoopSIMD<LoopSIMD<@SCALAR@, 2>, 5> >();
 
   } //namespace Simd
 } // namespace Dune