Update VTK-m to get GCC 6.1 compiler fixes
VTK-m + OpenMP + GCC 6.1 + >= O2 caused compile ICE's when calling functions that had a return value but had no return statement. This occurs in VTK-m when we have functions that just throw execptions.
VTK-m + OpenMP + GCC 6.1 + >= O2 caused compile ICE's when calling functions that had a return value but had no return statement. This occurs in VTK-m when we have functions that just throw execptions.