[m-dev.] diff: polymorphism.m bug fix

[Fergus Henderson]

Thomas Charles CONWAY, you wrote:
> > compiler/polymorphism.m:
> > 	Fix another bug in the recalculation of the non-local variables:
> > 	we need to requantify if we have added any type variables,
> > 	not just if we have added type variables that are non-local
> > 	at the top level.
> 
> This diff looks fine. Do you have a test case?

Yes, on /home/mercury :-(

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