[m-dev.] diff: accurate gc typeinfo variable bug.

[Fergus Henderson]

Tyson Richard DOWD, you wrote:
> 
> Fix a bug in compilation in accurate GC grades.
> 
> compiler/polymorphism.m:
> 	Add any introduced typeinfo variables to the typevar map.
> 	Without this unbound type variables won't not occur in the 
> 	typevar map, and the liveness calculations won't be able to
> 	make sure the typeinfos for the unbound type variables are
> 	kept live when they should be. (that is, the map lookups would
> 	fail looking in the typevar map).

That looks fine.

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