[Arith] Fix handling of overlapping predicates #15555
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When the lower bound predicate is present, `TryFuseIters` will rewrite an expression to `IterMarkWithOffset`, where the iter mark (structured form) has minimum value of zero. During rewriting, when the subexpression matches a previous rewritten result (`IterMarkWithOffset`), previously it doesn't correctly add the offset to the result `IterMarkWithOffset`, and causes inconsistency between the flattened form and the structured (normal) form.
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When the lower bound predicate is present,
TryFuseIterswill rewrite an expression toIterMarkWithOffset, where the iter mark (structured form) has minimum value of zero. During rewriting, when the subexpression matches a previous rewritten result (IterMarkWithOffset), previously it doesn't correctly add the offset to the resultIterMarkWithOffset, and causes inconsistency between the flattened form and the structured (normal) form.cc @wrongtest-intellif @spectrometerHBH