[m-dev.] For review: a change in MR_trace_event_external()

[Fergus Henderson]

Erwan Jahier, you wrote:
> 
> This one is for Zoltan or Fergus.
> 
> This change undo a change made by Zoltan quite a long time ago.
> 
> runtime/mercury_trace.c:
> runtime/mercury_trace_external.c:
> runtime/mercury_trace_external.c:
> 	Add "MR_trace_cmd_info *cmd" in argument of MR_trace_event_external().

What's the rationale for this change?

-- 
Fergus Henderson              | Designing grand concepts is fun;
fjh at cs.mu.oz.au               | finding nitty little bugs is just work.
http://www.cs.mu.oz.au/~fjh   | -- Brooks, in "The Mythical Man-Month".
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