fur%netscape.com 7e85101bed Faster interference graph simplification due to Amancio Hasty.
It optimizes for two cases:

 + The case when every node in the interference graph has degree less
   than K and is therefore trivially K-colorable.

 + The case when some node in the interference graph is K-colorable
   using simplify's node-subtraction heuristic.  Therefore, no spilling
   will take place and no spill costs need be taken into account.


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