perform_step! refactor for Rosenbrock #3971

Job	Run time
test (InterfaceI, 1)	7m 57s
test (InterfaceII, 1)	6m 45s
test (InterfaceIII, 1)	6m 49s
test (Integrators_I, 1)	13m 55s
test (AlgConvergence_I, 1)	7m 18s
test (AlgConvergence_II, 1)	5m 41s
test (AlgConvergence_III, 1)	9m 2s
test (Downstream, 1)	13m 59s
test (ODEInterfaceRegression, 1)	8m 2s
test (Multithreading, 1)	9m 46s
test (OrdinaryDiffEqAdamsBashforthMoulton, 1)	7m 20s
test (OrdinaryDiffEqBDF, 1)	9m 29s
test (OrdinaryDiffEqCore, 1)	5m 53s
test (OrdinaryDiffEqDefault, 1)	6m 16s
test (OrdinaryDiffEqDifferentiation, 1)	6m 5s
test (OrdinaryDiffEqExplicitRK, 1)	5m 52s
test (OrdinaryDiffEqExponentialRK, 1)	8m 34s
test (OrdinaryDiffEqExtrapolation, 1)	8m 1s
test (OrdinaryDiffEqFIRK, 1)	7m 44s
test (OrdinaryDiffEqFeagin, 1)	7m 43s
test (OrdinaryDiffEqFunctionMap, 1)	5m 52s
test (OrdinaryDiffEqHighOrderRK, 1)	6m 35s
test (OrdinaryDiffEqIMEXMultistep, 1)	6m 5s
test (OrdinaryDiffEqLinear, 1)	8m 6s
test (OrdinaryDiffEqLowOrderRK, 1)	7m 32s
test (OrdinaryDiffEqLowStorageRK, 1)	12m 58s
test (OrdinaryDiffEqNordsieck, 1)	6m 55s
test (OrdinaryDiffEqPDIRK, 1)	5m 46s
test (OrdinaryDiffEqPRK, 1)	5m 58s
test (OrdinaryDiffEqQPRK, 1)	6m 56s
test (OrdinaryDiffEqRKN, 1)	8m 13s
test (OrdinaryDiffEqRosenbrock, 1)	8m 36s
test (OrdinaryDiffEqSDIRK, 1)	5m 51s
test (OrdinaryDiffEqSSPRK, 1)	9m 3s
test (OrdinaryDiffEqStabilizedIRK, 1)	6m 18s
test (OrdinaryDiffEqStabilizedRK, 1)	8m 5s
test (OrdinaryDiffEqSymplecticRK, 1)	14m 1s
test (OrdinaryDiffEqTsit5, 1)	5m 44s
test (OrdinaryDiffEqVerner, 1)	6m 12s
	5h 6m 57s

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