Add KernelAbstractions.get_backend for VectorOfArray #921

Job	Run time
DiffEqBase.jl/Downstream2/1	24m 43s
DiffEqBase.jl/Core/1	3m 56s
SciMLBase.jl/Core/1	7m 12s
SciMLSensitivity.jl/Core1/1	46m 48s
SciMLSensitivity.jl/Core4/1	36m 5s
OrdinaryDiffEq.jl/Core/1	16m 12s
DelayDiffEq.jl/Interface/1	12m 8s
SciMLSensitivity.jl/Core3/1	39m 42s
SciMLSensitivity.jl/Core5/1	1h 1m 21s
SciMLSensitivity.jl/Core6/1	38m 9s
OrdinaryDiffEq.jl/Interface/1	1h 22m 54s
DiffEqSensitivity.jl/Core/1	18m 9s
LabelledArrays.jl/RecursiveArrayTools/1	6m 53s
DiffEqBase.jl/Downstream/1	23m 38s
SciMLSensitivity.jl/Core2/1	39m 35s
	7h 37m 25s

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