*Steps to reproduce:*
# Create a new graph, a new enum and a Switch node
# Create a BBV for the enum and assign it to the Switch node
# Connect the Switch node to the Start node, and create and connect a LogMessage to the first Switch port.
# Attach the graph to a GameObject
# 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.