Steps to reproduce:

1. Create a new graph, a new enum and a Switch node
2. Create a BBV for the enum and assign it to the Switch node
3. Connect the Switch node to the Start node, and create and connect a LogMessage to the first Switch port.
4. Attach the graph to a GameObject
5. Enter playmode and profile the code (Profiler, Deep Profile mode, GC and Timeline markers)

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Actual results: 

• Observe that SwitchComposite is creating GC.Alloc every frame

Expected results: 

• SwitchComposite doesn't GC.Alloc every frame.

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Reproducible with versions: 
1.0.0 - 1.0.11

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Notes:

•  SwitchComposite should cache enum value the first time.