[m-dev.] for review: a big step towards the trace-based debugger (part 2 of 3)

[Tyson Dowd]

Oops, a bit too quick on the ZZ-send.

I don't think the macros at the bottom of mercury_stack_layout that
say 
	/* The following macros support obsolete code. */ 
are used anymore. So they can probably be removed.

Other than my comments, everything else in part 2 is fine.


-- 
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