[m-rev.] trivial diff: agc: overwrite garbage with 0xDEADBEAF

[Ralph Becket]

Fergus Henderson, Tuesday,  4 June 2002:
> Estimated hours taken: 0.1
> 
> runtime/mercury_accurate_gc.c:
> 	When clearing the old heap entries, use a recognizable value
> 	(0xDEADBEAF), rather than 1, which is easily mistaken for live data.

0xDEADBEEF, surely?

- Ralph
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