[m-dev.] diff: uniq_array.m bug fix and enhancement

[Fergus Henderson]

Andrew Bromage, you wrote:
> 
> Fergus, could you review this one please?

> 	- Bug fix to uniq_array__resize/4.  Previously, if the
> 	  destination array size was smaller than the source array,
> 	  ML_resize_uniq_array would overwrite the bounds of the
> 	  newly created array.

Oops.  Thanks.

> 	- Added new predicate uniq_array__shrink/3.

Your changes look fine.

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