perform_step! refactor for Rosenbrock #3981

Job	Run time
test (InterfaceI, 1)	7m 58s
test (InterfaceII, 1)	6m 39s
test (InterfaceIII, 1)	7m 8s
test (Integrators_I, 1)	13m 38s
test (AlgConvergence_I, 1)	7m 10s
test (AlgConvergence_II, 1)	6m 4s
test (AlgConvergence_III, 1)	9m 4s
test (Downstream, 1)	11m 30s
test (ODEInterfaceRegression, 1)	8m 7s
test (Multithreading, 1)	10m 4s
test (OrdinaryDiffEqAdamsBashforthMoulton, 1)	7m 17s
test (OrdinaryDiffEqBDF, 1)	9m 24s
test (OrdinaryDiffEqCore, 1)	5m 59s
test (OrdinaryDiffEqDefault, 1)	6m 4s
test (OrdinaryDiffEqDifferentiation, 1)	5m 54s
test (OrdinaryDiffEqExplicitRK, 1)	6m 11s
test (OrdinaryDiffEqExponentialRK, 1)	9m 7s
test (OrdinaryDiffEqExtrapolation, 1)	8m 18s
test (OrdinaryDiffEqFIRK, 1)	7m 59s
test (OrdinaryDiffEqFeagin, 1)	8m 7s
test (OrdinaryDiffEqFunctionMap, 1)	5m 49s
test (OrdinaryDiffEqHighOrderRK, 1)	6m 47s
test (OrdinaryDiffEqIMEXMultistep, 1)	5m 51s
test (OrdinaryDiffEqLinear, 1)	7m 56s
test (OrdinaryDiffEqLowOrderRK, 1)	7m 21s
test (OrdinaryDiffEqLowStorageRK, 1)	12m 59s
test (OrdinaryDiffEqNordsieck, 1)	6m 59s
test (OrdinaryDiffEqPDIRK, 1)	5m 54s
test (OrdinaryDiffEqPRK, 1)	5m 44s
test (OrdinaryDiffEqQPRK, 1)	6m 57s
test (OrdinaryDiffEqRKN, 1)	8m 29s
test (OrdinaryDiffEqRosenbrock, 1)	8m 32s
test (OrdinaryDiffEqSDIRK, 1)	5m 59s
test (OrdinaryDiffEqSSPRK, 1)	9m 23s
test (OrdinaryDiffEqStabilizedIRK, 1)	6m 13s
test (OrdinaryDiffEqStabilizedRK, 1)	8m 8s
test (OrdinaryDiffEqSymplecticRK, 1)	14m 13s
test (OrdinaryDiffEqTsit5, 1)	6m 7s
test (OrdinaryDiffEqVerner, 1)	5m 56s
	5h 6m 59s

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