Avoid list concatenation when collecting all paths in flattenExpr #735
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Instead of concatenating branches from true and false cases of ITE, we use the accumulator to accumulate the branches. Since we are prepending, we traverse the false case first, so that in the accumulator, the paths from true case will end up before the branches from the false case.
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Description
Instead of concatenating branches from true and false cases of ITE, we use the accumulator to accumulate the branches.
Since we are prepending, we traverse the false case first, so that in the accumulator, the paths from true case will end up before the branches from the false case.
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