[m-rev.] diff: 3% speedup on tools/speedtest

[Ralph Becket]

Zoltan Somogyi, Wednesday, 19 August 2009:
> compiler/dead_proc_elim.m:
> 	Use set_tree234s instead of plain sets. Since this module does
> 	a lot of manipulation of big sets, the faster operations allowed
> 	by the tree234 structure lead to a 3% speedup.

This is great.  I'm starting to wonder whether set_tree234 should
be the default set implementation.
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