Support an alternative form for box_free

box_free currently takes a pointer. With the prospect of the Box type
definition changing in the future to include an allocator, box_free will
also need to be aware of this. In order to prepare for that future, we
allow box_free to take a form where its argument are the fields of the
Box.

e.g. if Box is defined as `Box(A, B, C)`, then box_free signature
becomes `box_free(a: A, b: B, c: C)`.

We however still allow the current form (taking a pointer), so that the
same compiler can handle both forms, which helps with bootstrap.

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