[m-dev.] New dumpstack allocation diff

[Fergus Henderson]

Andrew Bromage, you wrote:
> 
> Added code to define and allocate the dumpstack, thus allowing the
> compiler to actually work in debug.* grades.
> 
> runtime/memory.c:
>         Change init_heap() to allocate the dumpstack_zone.
>         Change default_handler() to produce a detstack dump.

That one looks fine to me.

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