Add Metal.jl support for lu_instance #810

Job	Run time
SparseDiffTools.jl/Core/1	14m 55s
DiffEqBase.jl/Downstream2/1	23m 36s
SciMLBase.jl/Core/1	6m 44s
DiffEqBase.jl/Core/1	3m 4s
SciMLSensitivity.jl/Core3/1	44m 58s
SciMLSensitivity.jl/Core1/1	54m 45s
SciMLSensitivity.jl/Core5/1	1h 1m 6s
OrdinaryDiffEq.jl/Core/1	12m 24s
SciMLSensitivity.jl/Core4/1	35m 19s
OrdinaryDiffEq.jl/Interface/1	1h 10m 58s
SciMLSensitivity.jl/Core2/1	41m 28s
DiffEqBase.jl/Downstream/1	21m 42s
DelayDiffEq.jl/Interface/1	14m 1s
	6h 45m 0s

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