Update VTK-m for GCC 4.8.5 fixes and osx-clang warning fixes

(cherry picked from commit 6b71feb3)

Accelerators/Vtkm/vtkmlib/ArrayConverters.hxx

@@ -46,7 +46,8 @@ vtkm::cont::VariantArrayHandle vtkDataArrayToVariantArrayHandle(DataArrayType* i
     {
       vtkm::Id numTuples = input->GetNumberOfTuples();
       auto subHandle = DataArrayToArrayHandle<DataArrayType, 1>::Wrap(input);
-      auto offsets = vtkm::cont::ArrayHandleCounting<vtkm::IdComponent>(0, numComps, numTuples);
+      auto offsets =
+        vtkm::cont::ArrayHandleCounting<vtkm::Id>(vtkm::Id(0), vtkm::Id(numComps), numTuples);
       auto handle = vtkm::cont::make_ArrayHandleGroupVecVariable(subHandle, offsets);
       return vtkm::cont::VariantArrayHandle(handle);
     }

vtk-m @ f395e084

-Subproject commit b30827215cfbfaae05943699d176ff1ca0e10471
+Subproject commit f395e084d821265d4ddc782f22c8d9edf8f1f411