Fixed broken try compile for gcc/clang atomic built-ins

It was also hiding a typo in the actual use of the builtins
Status Job ID Name Coverage
  External
passed cdash

passed ghostflow-branch-check-master

passed vtk@master-adora-linux-shared-release+cuda+gcc+mpi+optix+python2+tbb+vtkm

passed vtk@master-bigmac-osx-shared-debug+adios2+clang+python2+vtkm

failed vtk@master-dejagore-linux-shared-release+cuda+gcc+mpi+openmp+python2+vtkm

passed vtk@master-duma-linux-shared-release+osmesa+ospray

running vtk@master-eeloo-linux-shared-release+adios2+extdeps+java+mpi+python3+qt+tbb+vtkm

1150:35:34

passed vtk@master-eeloo-linux-shared-release+mpi+nogl

passed vtk@master-luigi-linux-shared-release+mpi+python2+tbb

failed vtk@master-mun-windows-shared-release+kits+mpi+python3+qt+tbb

passed vtk@master-mun-windows-shared-release+mpi+python3+tbb+vtkm

failed vtk@master-mun-windows-static-release+mpi+qt+tbb

passed vtk@master-taanab-linux-shared-release+adios2+mpi+python2

passed vtk@master-trey-osx-shared-release+python3+qt

passed cdash

passed vtk@master-adora-linux-shared-release+cuda+gcc+mpi+optix+python2+tbb+vtkm

00:41:59

passed vtk@master-adora-linux-shared-release+cuda+gcc+mpi+optix+python2+tbb+vtkm

passed vtk@master-adora-linux-shared-release+cuda+gcc+mpi+optix+python2+tbb+vtkm

00:05:26

passed vtk@master-adora-linux-shared-release+cuda+gcc+mpi+optix+python2+tbb+vtkm

passed vtk@master-adora-linux-shared-release+cuda+gcc+mpi+optix+python2+tbb+vtkm

passed vtk@master-bigmac-osx-shared-debug+adios2+clang+python2+vtkm

passed vtk@master-bigmac-osx-shared-debug+adios2+clang+python2+vtkm

00:24:43

passed vtk@master-bigmac-osx-shared-debug+adios2+clang+python2+vtkm

passed vtk@master-bigmac-osx-shared-debug+adios2+clang+python2+vtkm

passed vtk@master-bigmac-osx-shared-debug+adios2+clang+python2+vtkm

00:27:10

failed vtk@master-dejagore-linux-shared-release+cuda+gcc+mpi+openmp+python2+vtkm

failed vtk@master-dejagore-linux-shared-release+cuda+gcc+mpi+openmp+python2+vtkm

failed vtk@master-dejagore-linux-shared-release+cuda+gcc+mpi+openmp+python2+vtkm

01:24:05

failed vtk@master-dejagore-linux-shared-release+cuda+gcc+mpi+openmp+python2+vtkm

failed vtk@master-dejagore-linux-shared-release+cuda+gcc+mpi+openmp+python2+vtkm

00:10:49

failed vtk@master-duma-linux-shared-release+osmesa+ospray

failed vtk@master-duma-linux-shared-release+osmesa+ospray

passed vtk@master-duma-linux-shared-release+osmesa+ospray

00:23:40

passed vtk@master-duma-linux-shared-release+osmesa+ospray

failed vtk@master-duma-linux-shared-release+osmesa+ospray

00:21:40

passed vtk@master-eeloo-linux-shared-release+mpi+nogl

00:29:00

passed vtk@master-eeloo-linux-shared-release+mpi+nogl

passed vtk@master-luigi-linux-shared-release+mpi+python2+tbb

passed vtk@master-luigi-linux-shared-release+mpi+python2+tbb

00:50:43

passed vtk@master-mun-windows-shared-release+kits+mpi+python3+qt+tbb

00:08:54

failed vtk@master-mun-windows-shared-release+kits+mpi+python3+qt+tbb

00:31:42

failed vtk@master-mun-windows-shared-release+kits+mpi+python3+qt+tbb

passed vtk@master-mun-windows-shared-release+kits+mpi+python3+qt+tbb

passed vtk@master-mun-windows-shared-release+kits+mpi+python3+qt+tbb

passed vtk@master-mun-windows-shared-release+mpi+python3+tbb+vtkm

00:08:42

passed vtk@master-mun-windows-shared-release+mpi+python3+tbb+vtkm

00:31:37

passed vtk@master-mun-windows-shared-release+mpi+python3+tbb+vtkm

passed vtk@master-mun-windows-shared-release+mpi+python3+tbb+vtkm

passed vtk@master-mun-windows-shared-release+mpi+python3+tbb+vtkm

failed vtk@master-mun-windows-static-release+mpi+qt+tbb

failed vtk@master-mun-windows-static-release+mpi+qt+tbb

00:28:17

failed vtk@master-mun-windows-static-release+mpi+qt+tbb

00:07:01

failed vtk@master-mun-windows-static-release+mpi+qt+tbb

failed vtk@master-mun-windows-static-release+mpi+qt+tbb

failed vtk@master-taanab-linux-shared-release+adios2+mpi+python2

passed vtk@master-taanab-linux-shared-release+adios2+mpi+python2

passed vtk@master-taanab-linux-shared-release+adios2+mpi+python2

00:24:21

failed vtk@master-taanab-linux-shared-release+adios2+mpi+python2

failed vtk@master-taanab-linux-shared-release+adios2+mpi+python2

00:20:16

passed vtk@master-trey-osx-shared-release+python3+qt

00:48:06

passed vtk@master-trey-osx-shared-release+python3+qt

passed vtk@master-trey-osx-shared-release+python3+qt

passed vtk@master-trey-osx-shared-release+python3+qt

passed vtk@master-trey-osx-shared-release+python3+qt

00:57:37