Scheduler cleanups, 3/N

[Jeff Law]

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On 03/24/11 07:11, Bernd Schmidt wrote:
> This caches dependency costs. The target adjust_cost macro can be quite
> expensive. This may not make much of a difference now, but in the final
> backtracking scheduler patches (which I'm omitting for the moment) we
> look at these costs a bit more often.
OK.
jeff

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