Fix missing private clauses in 3D viscous GPU loops #4437

Job	Run time
Detect File Changes	10s
Lint Gate	1m 21s
Github (ubuntu, mpi, no-debug, false)	52m 14s
Github (ubuntu, mpi, debug, false)	52m 30s
Github (macos, mpi, debug, false)	53m 18s
Github (ubuntu, mpi, no-debug, true)	52m 14s
Github (ubuntu, mpi, debug, true)	52m 16s
Oak Ridge \| Frontier (gpu-acc)	1s
Georgia Tech \| Phoenix (gpu-omp)	1s
Github (macos, mpi, no-debug, false)	53m 15s
Github (ubuntu, no-mpi, single, no-debug, false)	28m 58s
Oak Ridge \| Frontier (AMD) (cpu)	53m 4s
Georgia Tech \| Phoenix (cpu)	1s
Oak Ridge \| Frontier (gpu-omp)	1s
Oak Ridge \| Frontier (cpu)	1s
Georgia Tech \| Phoenix (gpu-acc)	1s
Oak Ridge \| Frontier (AMD) (gpu-omp)	53m 4s
	7h 32m 30s

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