perform_step! refactor for Rosenbrock #4012

Job	Run time
DelayDiffEq.jl/Interface/1	13m 38s
DelayDiffEq.jl/Integrators/1	12m 25s
DelayDiffEq.jl/Regression/1	12m 9s
StochasticDiffEq.jl/Interface1/1	25m 25s
StochasticDiffEq.jl/Interface2/1	1h 1m 12s
StochasticDiffEq.jl/Interface3/1	16m 6s
StochasticDiffEq.jl/AlgConvergence/1	15m 11s
DiffEqCallbacks.jl/All/1	22m 23s
SciMLSensitivity.jl/Core1/1	43m 2s
SciMLSensitivity.jl/Core2/1	36m 56s
SciMLSensitivity.jl/Core3/1	37m 27s
SciMLSensitivity.jl/Core4/1	52m 2s
SciMLSensitivity.jl/Core5/1	46m 57s
ModelingToolkit.jl/All/1	37m 44s
DiffEqDevTools.jl/Core/1	15m 58s
ProbNumDiffEq.jl/Downstream/1	18m 31s
PositiveIntegrators.jl/Downstream/1	19m 27s
	8h 6m 33s

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