Reduce code bloat in closure

For the rust-call ABI, the last function argument is a tuple that gets
untupled for the actual call. For bare functions using this ABI, the
code has access to the tuple, so we need to tuple the arguments again.
But closures can't actually access the tuple. Their arguments map to the
elements in the tuple. So what we currently do is to tuple the arguments
and then immediately untuple them again, which is pretty useless and we
can just omit it.

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