perform_step! refactor for Rosenbrock #3982

Job	Run time
test (InterfaceI, 1)	8m 7s
test (InterfaceII, 1)	6m 48s
test (InterfaceIII, 1)	6m 50s
test (Integrators_I, 1)	13m 35s
test (AlgConvergence_I, 1)	7m 24s
test (AlgConvergence_II, 1)	5m 54s
test (AlgConvergence_III, 1)	8m 38s
test (Downstream, 1)	14m 26s
test (ODEInterfaceRegression, 1)	8m 3s
test (Multithreading, 1)	9m 48s
test (OrdinaryDiffEqAdamsBashforthMoulton, 1)	7m 13s
test (OrdinaryDiffEqBDF, 1)	9m 43s
test (OrdinaryDiffEqCore, 1)	5m 52s
test (OrdinaryDiffEqDefault, 1)	6m 23s
test (OrdinaryDiffEqDifferentiation, 1)	5m 49s
test (OrdinaryDiffEqExplicitRK, 1)	6m 6s
test (OrdinaryDiffEqExponentialRK, 1)	8m 27s
test (OrdinaryDiffEqExtrapolation, 1)	8m 9s
test (OrdinaryDiffEqFIRK, 1)	7m 39s
test (OrdinaryDiffEqFeagin, 1)	7m 48s
test (OrdinaryDiffEqFunctionMap, 1)	6m 8s
test (OrdinaryDiffEqHighOrderRK, 1)	6m 38s
test (OrdinaryDiffEqIMEXMultistep, 1)	5m 56s
test (OrdinaryDiffEqLinear, 1)	8m 10s
test (OrdinaryDiffEqLowOrderRK, 1)	7m 31s
test (OrdinaryDiffEqLowStorageRK, 1)	13m 19s
test (OrdinaryDiffEqNordsieck, 1)	7m 15s
test (OrdinaryDiffEqPDIRK, 1)	6m 7s
test (OrdinaryDiffEqPRK, 1)	5m 58s
test (OrdinaryDiffEqQPRK, 1)	7m 14s
test (OrdinaryDiffEqRKN, 1)	8m 27s
test (OrdinaryDiffEqRosenbrock, 1)	9m 7s
test (OrdinaryDiffEqSDIRK, 1)	6m 20s
test (OrdinaryDiffEqSSPRK, 1)	9m 56s
test (OrdinaryDiffEqStabilizedIRK, 1)	7m 4s
test (OrdinaryDiffEqStabilizedRK, 1)	8m 26s
test (OrdinaryDiffEqSymplecticRK, 1)	14m 50s
test (OrdinaryDiffEqTsit5, 1)	6m 25s
test (OrdinaryDiffEqVerner, 1)	6m 3s
	5h 13m 36s

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