[m-dev.] diff - mode error messages

[Fergus Henderson]

Simon TAYLOR, you wrote:
> 
> compiler/det_report.m
> compiler/mode_errors.m
> 	Use the declared modes when writing error messages.
> 
> compiler/hlds_pred.m
> 	Added a predicate proc_info_declared_argmodes which
> 	returns the declared modes if they exist, returning
> 	the inferred modes otherwise.

That one looks fine, please commit it.

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