Fix missing private clauses in 3D viscous GPU loops #4534

Job	Run time
Detect File Changes	12s
Lint Gate	1m 18s
Github (ubuntu, mpi, no-debug, false)	2h 15m 48s
Github (ubuntu, mpi, debug, false)	2h 40m 21s
Github (macos, mpi, no-debug, false)	1h 9m 11s
Github (ubuntu, mpi, no-debug, true)	1h 33m 56s
Github (macos, mpi, debug, false)	1h 2m 34s
Github (ubuntu, no-mpi, single, no-debug, false)	31m 20s
Georgia Tech \| Phoenix (gpu-acc)	1h 38m 30s
Oak Ridge \| Frontier (gpu-acc)	6h 36m 52s
Oak Ridge \| Frontier (gpu-omp)	1s
Github (ubuntu, mpi, debug, true)	1h 34m 26s
Georgia Tech \| Phoenix (cpu)	13m 44s
Oak Ridge \| Frontier (AMD) (cpu)	1s
Georgia Tech \| Phoenix (gpu-omp)	10m 1s
Oak Ridge \| Frontier (AMD) (gpu-omp)	1s
Oak Ridge \| Frontier (cpu)	6h 36m 52s
	1d 2h 5m 8s

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