perform_step! refactor for Rosenbrock #3970

Job	Run time
test (InterfaceI, 1)	8m 19s
test (InterfaceII, 1)	6m 34s
test (InterfaceIII, 1)	6m 54s
test (Integrators_I, 1)	13m 45s
test (AlgConvergence_I, 1)	7m 2s
test (AlgConvergence_II, 1)	5m 51s
test (AlgConvergence_III, 1)	8m 56s
test (Downstream, 1)	11m 50s
test (ODEInterfaceRegression, 1)	8m 20s
test (Multithreading, 1)	9m 58s
test (OrdinaryDiffEqAdamsBashforthMoulton, 1)	7m 9s
test (OrdinaryDiffEqBDF, 1)	10m 55s
test (OrdinaryDiffEqCore, 1)	6m 4s
test (OrdinaryDiffEqDefault, 1)	6m 3s
test (OrdinaryDiffEqDifferentiation, 1)	5m 46s
test (OrdinaryDiffEqExplicitRK, 1)	6m 0s
test (OrdinaryDiffEqExponentialRK, 1)	8m 56s
test (OrdinaryDiffEqExtrapolation, 1)	8m 12s
test (OrdinaryDiffEqFIRK, 1)	7m 54s
test (OrdinaryDiffEqFeagin, 1)	7m 34s
test (OrdinaryDiffEqFunctionMap, 1)	6m 14s
test (OrdinaryDiffEqHighOrderRK, 1)	6m 38s
test (OrdinaryDiffEqIMEXMultistep, 1)	5m 50s
test (OrdinaryDiffEqLinear, 1)	7m 58s
test (OrdinaryDiffEqLowOrderRK, 1)	7m 31s
test (OrdinaryDiffEqLowStorageRK, 1)	12m 34s
test (OrdinaryDiffEqNordsieck, 1)	7m 31s
test (OrdinaryDiffEqPDIRK, 1)	6m 6s
test (OrdinaryDiffEqPRK, 1)	5m 46s
test (OrdinaryDiffEqQPRK, 1)	7m 15s
test (OrdinaryDiffEqRKN, 1)	8m 53s
test (OrdinaryDiffEqRosenbrock, 1)	9m 36s
test (OrdinaryDiffEqSDIRK, 1)	5m 59s
test (OrdinaryDiffEqSSPRK, 1)	9m 19s
test (OrdinaryDiffEqStabilizedIRK, 1)	6m 17s
test (OrdinaryDiffEqStabilizedRK, 1)	8m 40s
test (OrdinaryDiffEqSymplecticRK, 1)	14m 5s
test (OrdinaryDiffEqTsit5, 1)	5m 51s
test (OrdinaryDiffEqVerner, 1)	5m 47s
	5h 9m 52s

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