[m-dev.] for review: subdivision of mercury_trace.c

[Thomas Charles CONWAY]

Fergus Henderson, you write:
> Comments?  I'm happy to make this change myself if you're happy with it.
> 

We haven't really thought about how tracing interacts with multi-
threaded (not necessarily parallel) execution. Apart from that can
of worms, I think that sounds like a good idea.

my 5c
Thomas
-- 
Thomas Conway    || conway at cs.mu.oz.au
AD DEUM ET VINUM || Nail here [] for new monitor.