Fix missing private clauses in 3D viscous GPU loops #4982

Job	Run time
Detect File Changes	9s
Lint Gate	1m 31s
Github (ubuntu, mpi, debug, true)	1h 46m 47s
Github (ubuntu, mpi, debug, false)	2h 18m 36s
Github (ubuntu, mpi, no-debug, true)	1h 34m 57s
Github (macos, mpi, debug, false)	56m 58s
Github (ubuntu, no-mpi, single, no-debug, false)	28m 59s
Georgia Tech \| Phoenix (gpu-omp)	1h 11m 6s
Oak Ridge \| Frontier (gpu-acc [2/2])	52m 21s
Github (macos, mpi, no-debug, false)	1h 8m 17s
Oak Ridge \| Frontier (cpu)	12m 11s
Georgia Tech \| Phoenix (cpu)	1h 3m 24s
Georgia Tech \| Phoenix (gpu-acc)	1h 0m 41s
Github (ubuntu, mpi, no-debug, false)	2h 15m 33s
Oak Ridge \| Frontier (gpu-acc [1/2])	6m 33s
Oak Ridge \| Frontier (AMD) (gpu-omp [1/2])	52m 44s
Oak Ridge \| Frontier (AMD) (gpu-omp [2/2])	11m 35s
Oak Ridge \| Frontier (gpu-omp [1/2])	1h 2m 3s
Oak Ridge \| Frontier (gpu-omp [2/2])	26m 7s
Oak Ridge \| Frontier (AMD) (cpu)	28m 43s
	17h 59m 15s

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