Make the comparator CmpExpIdx respect C++ requirements #932
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…equirements. With the current code, if there are two id Expressions: `id1` and `id2` and one non-id expression `expr`, we could have `id1 < id2` and `id2 < expr < id1`. This CL makes ids to be ordered before non-ids. Also remove call to Expression::equal(), which also made a checker complain the ordering was not strict, probably because it is not transitive.
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With the current code, if there are two id Expressions:
id1andid2and one non-id expressionexpr, we could haveid1 < id2andid2 < expr < id1. This CL makes ids to be ordered before non-ids.Also remove call to Expression::equal(), which also made a checker complain the ordering was not strict, probably because it is not transitive.