[m-rev.] for review: avoid memory allocation in version_hash_table

[Julien Fischer]

On Fri, 27 Jun 2008, Peter Wang wrote:

> Estimated hours taken: 0.1
> Branches: main
>
> library/version_hash_table.m:
> 	Don't wrap the user-supplied hash predicate (with two outputs) by a
> 	hash function (that returns a tuple of two values) to avoid an inst
> 	cast.  Each lookup incurs an additional memory allocation to create
> 	the tuple.

That's fine.

Julien.
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