Polymorphic option types now compile to C

Fixed an issue whereby an option constructor that was never
constructed, but only matched on, would cause compilation to
fail. Temporarily fixed an issue where union types that can be
entirely stack-allocated were not being treated as such, by simply
heap-allocating all unions. Need to adapt the code generator to handle
this case properly. Fixed a further small issue whereby multiple union
types would confuse the type specialisation pass.

Added a test case for compiling option types.

RISCV now generates C code, but there are still some bugs that need to
be squashed before it compile and work.

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