Richard Kenner 0e1c7fc777 (make_range): Don't merge unsigned case with range containing upper bound;
instead merge just with zero and convert a range with no upper bound to
opposite one with no lower bound.
(merge_ranges): In (+,-) case, don't treat subset specially if the upper
bounds are the same; fix typo in others case here.

From-SVN: r13090
1996-11-01 09:49:54 -05:00
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