FIRST_TRANSLATION

The initial translation into Level Two instructions customized to a particular raw function. This at least should avoid the cost of fetching nybblecodes. It also avoids looking up monomorphic methods at execution time, and can inline or even fold calls to suitable primitives. The inlined calls to infallible primitives are simpler than the calls to fallible ones or non-primitives or polymorphic methods. Inlined primitive attempts avoid having to reify the calling continuation in the case that they're successful, but have to reify if the primitive fails.