[m-rev.] for review: more efficient operator lookups

[Ralph Becket]

Zoltan Somogyi, Monday, 25 September 2006:
> For review by anyone. The diff to mercury_compile.m is not meant to be
> committed; it was used only for measuring the performance impact. The results
> showed that the time required to write out the HLDS for four of the largest
> modules of the Mercury compiler went from 19.48, 4.96, 5.74 and 4.42 seconds
> to 19.10, 4.80, 5.59 and 4.26 seconds respectively.
> 
> Zoltan.
> 
> library/ops.m:
> 	Change the representation of operators to allow a single lookup to
> 	gather all available information about an operator.

That looks great - the simplification of the interface is probably of
greater benefit than any increase in efficiency.
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