Use trait to define backend #114
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Addressing
This PR includes a definition of a
BackendCompilertrait, and the trait is implemented for the Plonk backend.The
BackendCompilertrait requires functions which take the base cases of three-address code operations (e.g.var + const = var) and adds them to a circuit. Operations which can be derived from the base cases algebraically do not nee to be implemented (e.g.var - const = varcan be derived from the earlier case).Only base-case arithmetic operations are required by the trait at the moment.
Marked as draft until the Halo2 backend is implemented as a BackendCompiler.