[m-dev.] diff: bug fix for higher-order implied modes

[Fergus Henderson]

Tyson Richard DOWD, you wrote:
> > 
> > compiler/modecheck_call.m:
> > compiler/modecheck_unify.m:
> > 	Fix a bug in the code to recompute the non-local variables
> > 	when handling calls to higher-order predicates or functions
> > 	in implied modes.
> 
> Looks fine, (although explicit comments explaining what was being done
> wouldn't hurt). Is there a test case for this?

I've just added one.

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