[cairo] Special case simplification for edges_compare_x_for_y_general()

[Chris Wilson]

Carl,
  Please can you look at the attached patch to speed up the 128bit
compare within edges_compare_x_for_y(). I don't propose to include it in
1.8 due to its complexity, but I'd appreciate a few more eyes looking
over it and seeing if it is as simple as it can be.
-- 
Chris Wilson
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