[m-rev.] for review: speed up boxing of foreign types

[Julien Fischer]

On Tue, 21 Aug 2007, Peter Wang wrote:

> Branches: main
>
> runtime/mercury_heap.h:
>        Provide fast paths in MR_MAYBE_BOX_FOREIGN_TYPE and
>        MR_MAYBE_UNBOX_FOREIGN_TYPE for the case where the foreign type has
>        the same size as the box.
>
>        An implementation of the RC4 cipher using bitmaps was ~6x faster on
>        neptune with this change in asm_fast.gc.  In hlc.gc there was no
>        difference.

That diff looks fine.

I am curious about why there was no difference in the hlc grade.

Julien.
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