[m-dev.] for review: fix bug in MR_based_stackvar

[Fergus Henderson]

On 23-Nov-1998, Mark Anthony BROWN <dougl at cs.mu.OZ.AU> wrote:
> 
> runtime/mercury_stacks.h:
> 	Add parentheses around a parameter of MR_based_stackvar, to
> 	avoid errors when the argument is an expression such as
> 	``slot + 1''.

That looks fine, thanks.

-- 
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