Fix C compilation for CHERI and MIPS

First, the specialisation of option types has been fixed by allowing
the specialisation of constructor return types - this essentially
means that a constructor, such as Some : 'a -> option('a) can get
specialised to int -> option(int), rather than int -> option('a). This
means that these constructors are treated like GADTs internally. Since
this only happens just before the C translation, I haven't put much
effort into making this very robust so far.

Second, there was a bug in C compilation for the typing of return
expressions in non-unit contexts, which has been fixed.

Finally support for vector literals that are non-bitvectors has been
added.

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