perform_step! refactor for Rosenbrock #3737

Job	Run time
test (InterfaceI, 1)	6m 9s
test (InterfaceII, 1)	8m 15s
test (InterfaceIII, 1)	5m 27s
test (Integrators_I, 1)	11m 51s
test (AlgConvergence_I, 1)	6m 14s
test (AlgConvergence_II, 1)	4m 56s
test (AlgConvergence_III, 1)	7m 36s
test (Downstream, 1)	10m 40s
test (ODEInterfaceRegression, 1)	6m 46s
test (Multithreading, 1)	9m 23s
test (OrdinaryDiffEqAdamsBashforthMoulton, 1)	6m 46s
test (OrdinaryDiffEqBDF, 1)	8m 53s
test (OrdinaryDiffEqDefault, 1)	5m 19s
test (OrdinaryDiffEqDifferentiation, 1)	5m 5s
test (OrdinaryDiffEqExplicitRK, 1)	5m 2s
test (OrdinaryDiffEqExponentialRK, 1)	8m 6s
test (OrdinaryDiffEqExtrapolation, 1)	8m 9s
test (OrdinaryDiffEqFIRK, 1)	6m 54s
test (OrdinaryDiffEqFeagin, 1)	6m 59s
test (OrdinaryDiffEqFunctionMap, 1)	5m 16s
test (OrdinaryDiffEqHighOrderRK, 1)	5m 12s
test (OrdinaryDiffEqIMEXMultistep, 1)	5m 21s
test (OrdinaryDiffEqLinear, 1)	6m 55s
test (OrdinaryDiffEqLowOrderRK, 1)	6m 54s
test (OrdinaryDiffEqLowStorageRK, 1)	12m 28s
test (OrdinaryDiffEqNordsieck, 1)	6m 7s
test (OrdinaryDiffEqPDIRK, 1)	5m 11s
test (OrdinaryDiffEqPRK, 1)	5m 28s
test (OrdinaryDiffEqQPRK, 1)	6m 16s
test (OrdinaryDiffEqRKN, 1)	7m 29s
test (OrdinaryDiffEqRosenbrock, 1)	5m 59s
test (OrdinaryDiffEqSDIRK, 1)	5m 20s
test (OrdinaryDiffEqSSPRK, 1)	9m 9s
test (OrdinaryDiffEqStabilizedIRK, 1)	5m 48s
test (OrdinaryDiffEqStabilizedRK, 1)	7m 25s
test (OrdinaryDiffEqSymplecticRK, 1)	13m 34s
test (OrdinaryDiffEqTsit5, 1)	5m 10s
test (OrdinaryDiffEqVerner, 1)	5m 8s
	4h 28m 40s

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