Stop exporting addrToByteArray, addrToByteArrayName and friends from Language.Haskell.TH.Syntax

addrToByteArray and addrToByteArrayName are two functions that are used in the Lift ByteArray instance. They are exported since all identifiers are currently exported from TH.Syntax.

I'm suggesting we remove these from the exports as they are just internals used to implement the instance.

I think exporting these was purely accidental.

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