[m-dev.] diff: liveness bug fix

[Fergus Henderson]

Zoltan Somogyi, you wrote:
> 
> compiler/liveness.m:
> 	Recompute nonlocal sets before starting liveness computations
> 	in order to avoid a compiler abort. The new version could in
> 	some cases also lead to the generation of better code through
> 	saving fewer variables across disjuncts.

That looks fine.

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