perform_step! refactor for Rosenbrock #3961

Job	Run time
test (InterfaceI, 1)	7m 31s
test (InterfaceII, 1)	6m 31s
test (InterfaceIII, 1)	6m 45s
test (Integrators_I, 1)	17m 37s
test (AlgConvergence_I, 1)	7m 27s
test (AlgConvergence_II, 1)	5m 37s
test (AlgConvergence_III, 1)	8m 34s
test (Downstream, 1)	11m 30s
test (ODEInterfaceRegression, 1)	8m 32s
test (Multithreading, 1)	10m 15s
test (OrdinaryDiffEqAdamsBashforthMoulton, 1)	7m 37s
test (OrdinaryDiffEqBDF, 1)	9m 45s
test (OrdinaryDiffEqCore, 1)	5m 43s
test (OrdinaryDiffEqDefault, 1)	5m 53s
test (OrdinaryDiffEqDifferentiation, 1)	6m 3s
test (OrdinaryDiffEqExplicitRK, 1)	5m 45s
test (OrdinaryDiffEqExponentialRK, 1)	8m 44s
test (OrdinaryDiffEqExtrapolation, 1)	8m 18s
test (OrdinaryDiffEqFIRK, 1)	7m 49s
test (OrdinaryDiffEqFeagin, 1)	7m 42s
test (OrdinaryDiffEqFunctionMap, 1)	5m 44s
test (OrdinaryDiffEqHighOrderRK, 1)	6m 32s
test (OrdinaryDiffEqIMEXMultistep, 1)	5m 52s
test (OrdinaryDiffEqLinear, 1)	6m 35s
test (OrdinaryDiffEqLowOrderRK, 1)	7m 33s
test (OrdinaryDiffEqLowStorageRK, 1)	13m 0s
test (OrdinaryDiffEqNordsieck, 1)	6m 46s
test (OrdinaryDiffEqPDIRK, 1)	5m 52s
test (OrdinaryDiffEqPRK, 1)	5m 52s
test (OrdinaryDiffEqQPRK, 1)	6m 52s
test (OrdinaryDiffEqRKN, 1)	8m 30s
test (OrdinaryDiffEqRosenbrock, 1)	7m 9s
test (OrdinaryDiffEqSDIRK, 1)	5m 43s
test (OrdinaryDiffEqSSPRK, 1)	9m 11s
test (OrdinaryDiffEqStabilizedIRK, 1)	6m 26s
test (OrdinaryDiffEqStabilizedRK, 1)	8m 1s
test (OrdinaryDiffEqSymplecticRK, 1)	14m 4s
test (OrdinaryDiffEqTsit5, 1)	5m 43s
test (OrdinaryDiffEqVerner, 1)	5m 47s
	5h 4m 50s

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